Ekaterina Poutrina - Academia.edu (original) (raw)

Papers by Ekaterina Poutrina

Research paper thumbnail of Nonreciprocal on the Nanoscale: Nonlinear Generation via Multipole Interference

Frontiers in Optics 2017, 2017

We demonstrate that non-reciprocal directionality of nonlinear generation is inherent to and real... more We demonstrate that non-reciprocal directionality of nonlinear generation is inherent to and realistically observable in the nonlinear multipolar response of nanostructures. Alternatively, nonlinear multipolar interference can ensure a directionally selective inhibition of the nonlinear process.

Research paper thumbnail of 1 Waveguide coupling via magnetic gratings with 2 effective strips 3

Kevin M. Roccapriore1, David P. Lyvers1,3, Dean P. Brown3,4, Ekaterina Poutrina3,4, Augustine M. ... more Kevin M. Roccapriore1, David P. Lyvers1,3, Dean P. Brown3,4, Ekaterina Poutrina3,4, Augustine M. 4 Urbas4, Thomas A. Germer5, and Vladimir P. Drachev1,2* 5 1 Department of Physics and Advance Materials Manufacturing Processing Institute, University of North 6 Texas, Denton, TX 76203, USA; kevin.roccapriore@my.unt.edu, walkingcub@gmail.com, 7 vladimir.drachev@unt.edu 8 2 Skolkovo Institute of Science and Technology, Moscow, 121205, Russia 9 3 UES, Inc., 4401 Dayton-Xenia Rd, Dayton, OH 45432, USA; dbrown@ues.com 10 4 Air Force Research Lab, Materials and Manufacturing Directorate, 3005 Hobson Way, Wright Patterson 11 AFB, OH 45433, USA; ekaterina.poutrina.ctr.ru@us.af.mil, augustine.urbas@wpafb.af.mil 12 5 Sensor Science Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, 13 MD 20899, USA; thomas.germer@nist.gov 14 * Correspondence: vladimir.drachev@unt.edu; Tel.: +1-940-565-4580 15

Research paper thumbnail of Designing hybrid lenses using metaoptics for enhanced optical performance

Metamaterials, Metadevices, and Metasystems 2021, 2021

Incorporating planar optics such as metalenses or metacorrectors into optical designs can drastic... more Incorporating planar optics such as metalenses or metacorrectors into optical designs can drastically improve the performance of imaging systems with additional benefits such as cost, size and weight improvements. However, modeling of such hybrid lenses is challenging because of the multiscale nature of the simulation. In this presentation, we show how to combine ray optic simulations with full wave simulations and Fourier optics approaches to model a whole compound lens considering all metasurface unit cell interactions and to study the effect of possible fabrication errors.

Research paper thumbnail of Waveguide Coupling via Magnetic Gratings with Effective Strips

Applied Sciences, 2018

Gratings with complex multilayer strips are studied under inclined incident light. Great interest... more Gratings with complex multilayer strips are studied under inclined incident light. Great interest in these gratings is due to applications as input/output tools for waveguides and as subwavelength metafilms. The structured strips introduce anisotropy in the effective parameters, providing additional flexibility in polarization and angular dependences of optical responses. Their characterization is challenging in the intermediate regime between subwavelength and diffractive modes. The transition between modes occurs at the Wood's anomaly wavelength, which is different at different angle of incidence. The usual characterization with an effective film using permittivity ε and permeability µ has limited effectiveness at normal incidence but does not apply at inclined illumination, due to the effect of periodicity. The optical properties are better characterized with effective medium strips instead of an effective medium layer to account for the multilayer strips and the underlying periodic nature of the grating. This approach is convenient for describing such intermediate gratings for two types of applications: both metafilms and the coupling of incident waves to waveguide modes or diffraction orders. The parameters of the effective strips are retrieved by matching the spectral-angular map at different incident angles.

Research paper thumbnail of Inherently Non-Reciprocal On The Nanoscale: Nonlinear Generation Via Multipole Interference

Frontiers in Optics 2016, 2016

Research paper thumbnail of Roadmap on optical metamaterials

Journal of Optics, 2016

Optical metamaterials have redefined how we understand light in notable ways: from strong respons... more Optical metamaterials have redefined how we understand light in notable ways: from strong response to optical magnetic fields, negative refraction, fast and slow light propagation in zero index and trapping structures, to flat, thin and perfect lenses. Many rules of thumb regarding optics, such as mu = 1, now have an exception, and basic formulas, such as the Fresnel equations, have been expanded. The field of metamaterials has developed strongly over the past two decades. Leveraging structured materials systems to generate tailored response to a stimulus, it has grown to encompass research in optics, electromagnetics, acoustics and, increasingly, novel hybrid materials responses. This roadmap is an effort to present emerging fronts in areas of optical metamaterials that could contribute and apply to other research communities. By anchoring each contribution in current work and prospectively discussing future potential and directions, the authors are translating the work of the field in selected areas to a wider community and offering an incentive for outside researchers to engage our community where solid links do not already exist.

Research paper thumbnail of Multipolar interference for non-reciprocal nonlinear generation

Research paper thumbnail of Deterministic Construction of Plasmonic Heterostructures in Well-Organized Arrays for Nanophotonic Materials

Research paper thumbnail of Multipolar analysis of linear and nonlinear unidirectional response from plasmonic dimers

CLEO: 2015, 2015

We develop the retrieval procedure for linear and nonlinear polarizabilities of plasmonic nanodim... more We develop the retrieval procedure for linear and nonlinear polarizabilities of plasmonic nanodimers and present examples of unidirectional scattering and nonlinear unidirectional generation from such geometries. Related effective parameters of periodic dimer arrangements are discussed.

Research paper thumbnail of Enhancing nonlinear response with metamaterials: from nonlinear parameters engineering to one-way imaging

We first summarize the approaches developed in our group allowing for the description of a nonlin... more We first summarize the approaches developed in our group allowing for the description of a nonlinear metamaterial media in terms of the effective nonlinear susceptibilities. We subsequently discuss the nonlinear magneto-electric coupling and demonstrate that it can lead to a non-reciprocal nonlinear imaging using a three-or four-wave mixing process, producing an image either on reflection or on transmission.

Research paper thumbnail of Three-wave mixing in microwave nonlinear metamaterial

CLEO:2011 - Laser Applications to Photonic Applications, 2011

ABSTRACT

Research paper thumbnail of Enhancing four-wave-mixing processes by nanowire arrays coupled to a gold film

Optics express, Jan 7, 2012

We consider the process of four-wave mixing in an array of gold nanowires strongly coupled to a g... more We consider the process of four-wave mixing in an array of gold nanowires strongly coupled to a gold film. Using full-wave simulations, we perform a quantitative comparison of the four-wave mixing efficiency associated with a bare film and films with nanowire arrays. We find that the strongly localized surface plasmon resonances of the coupled nanowires provide an additional local field enhancement that, along with the delocalized surface plasmon of the film, produces an overall four-wave mixing efficiency enhancement of up to six orders of magnitude over that of the bare film. The enhancement occurs over a wide range of excitation angles. The film-coupled nanowire array is easily amenable to nanofabrication, and could find application as an ultra-compact component for integrated photonic and quantum optic systems.

Research paper thumbnail of Controlling Nonlinearity with Structured Metamaterials

Nonlinear Optics, 2011

... David R. Smith, Ekaterina Poutrina, Da Huang, Alec Rose, Stephane Larouche Center forMetamate... more ... David R. Smith, Ekaterina Poutrina, Da Huang, Alec Rose, Stephane Larouche Center forMetamaterials and Integrated Plasmonics and Electrical and Computer Engineering, Duke University, Box 90291, Durham, NC, 27708 USA Author e-mail address: drsmith@ee.duke.edu ...

Research paper thumbnail of Nonlinear parameter retrieval from three- and four-wave mixing in metamaterials

Physical Review E, 2010

We present a generalized nonlinear susceptibility retrieval method for metamaterials based on tra... more We present a generalized nonlinear susceptibility retrieval method for metamaterials based on transfer matrices and valid in the nondepleted pump approximation. We construct a general formalism to describe the transfer matrix method for nonlinear media and apply it to the processes of three-and four-wave mixing. The accuracy of this approach is verified via finite element simulations. The method is then reversed to give a set of equations for retrieving the nonlinear susceptibility. Finally, we apply the proposed retrieval operation to a three-wave mixing transmission experiment performed on a varactor loaded split ring resonator metamaterial sample and find quantitative agreement with an analytical effective medium theory model.

Research paper thumbnail of Origin of second-harmonic generation enhancement in optical split-ring resonators

Physical Review B, 2012

We present a study of the second-order nonlinear optical properties of metal-based metamaterials.... more We present a study of the second-order nonlinear optical properties of metal-based metamaterials. A hydrodynamic model for electronic response is used, in which nonlinear surface contributions are expressed in terms of the bulk polarization. The model is in good agreement with published experimental results, and clarifies the mechanisms contributing to the nonlinear response. In particular, we show that the reported enhancement of second-harmonic in split-ring resonator based media is driven by the electric rather than the magnetic properties of the structure.

Research paper thumbnail of Second-harmonic generation in metallic nanoparticles: Clarification of the role of the surface

Physical Review B, 2012

The public reporting burden for this collection of information is estimated to average 1 hour per... more The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggesstions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports,

Research paper thumbnail of Nonlinear magnetoelectric metamaterials: Analysis and homogenization via a microscopic coupled-mode theory

Physical Review A, 2012

Artificially structured metamaterials hybridized with elements that respond nonlinearly to incide... more Artificially structured metamaterials hybridized with elements that respond nonlinearly to incident electromagnetic fields can, from a macroscopic perspective, support nonlinear responses that cannot be described by purely electric or magnetic interactions. To investigate the mechanisms and behaviors of such interactions, termed nonlinear magnetoelectric coupling, we develop a set of coupled-mode equations for describing three-wave mixing in a metamaterial, using Bloch modes as the basis. By equating these coupled-mode equations to those of a homogenized system, we derive closed-form expressions for the macroscopic nonlinear susceptibilities. From these expressions, a great deal can be inferred about the nature and construction of magnetoelectric nonlinearities in metamaterials. As an example, we apply this method in the analysis of a prototypical nonlinear magnetoelectric metamaterial. In particular, we show that independent control of the eight second-order susceptibility tensors encompasses a massive parameter space from which new realms of nonlinear interference and wave manipulation can be accessed.

Research paper thumbnail of Nonlinear oscillator metamaterial model: numerical and experimental verification

Optics Express, 2011

We verify numerically and experimentally the accuracy of an analytical model used to derive the e... more We verify numerically and experimentally the accuracy of an analytical model used to derive the effective nonlinear susceptibilities of a varactor-loaded split ring resonator (VLSRR) magnetic medium. For the numerical validation, a nonlinear oscillator model for the effective magnetization of the metamaterial is applied in conjunction with Maxwell equations and the two sets of equations solved numerically in the timedomain. The computed second harmonic generation (SHG) from a slab of a nonlinear material is then compared with the analytical model. The computed SHG is in excellent agreement with that predicted by the analytical model, both in terms of magnitude and spectral characteristics. Moreover, experimental measurements of the power transmitted through a fabricated VLSRR metamaterial at several power levels are also in agreement with the model, illustrating that the effective medium techniques associated with metamaterials can accurately be transitioned to nonlinear systems.

Research paper thumbnail of Forward and backward unidirectional scattering from plasmonic coupled wires

Optics Express, 2013

We analyze the resonant electromagnetic response of subwavelength plasmonic dimers formed by two ... more We analyze the resonant electromagnetic response of subwavelength plasmonic dimers formed by two silver strips separated by a thin dielectric spacer and embedded in a uniform dielectric media. We demonstrate that the off-resonant electric and resonant, geometric shape-leveraged, magnetic polarizabilities of the dimer element can be designed to have close absolute values in a certain spectral range, resulting in a predominantly unidirectional scattering of the incident field due to pronounced magneto-electric interference. Switching between forward and backward directionality can be achieved with a single element by changing the excitation wavelength, with the scattering direction defined by the relative phases of the polarizabilities. We extend the analysis to some periodic configurations, including the specific case of a perforated metal film, and discuss the differences between the observed unidirectional scattering and the extraordinary transmission effect. The unidirectional response can be preserved and enhanced with periodic arrays of dimers and can find applications in nanoantenna devices, integrated optic circuits, sensors with nanoparticles, photovoltaic systems, or perfect absorbers; while the option of switching between forward and backward unidirectional scattering may create interesting possibilities for manipulating optical pressure forces.

Research paper thumbnail of Surfaces, films, and multilayers for compact nonlinear plasmonics

Journal of the Optical Society of America B, 2013

ABSTRACT

Research paper thumbnail of Nonreciprocal on the Nanoscale: Nonlinear Generation via Multipole Interference

Frontiers in Optics 2017, 2017

We demonstrate that non-reciprocal directionality of nonlinear generation is inherent to and real... more We demonstrate that non-reciprocal directionality of nonlinear generation is inherent to and realistically observable in the nonlinear multipolar response of nanostructures. Alternatively, nonlinear multipolar interference can ensure a directionally selective inhibition of the nonlinear process.

Research paper thumbnail of 1 Waveguide coupling via magnetic gratings with 2 effective strips 3

Kevin M. Roccapriore1, David P. Lyvers1,3, Dean P. Brown3,4, Ekaterina Poutrina3,4, Augustine M. ... more Kevin M. Roccapriore1, David P. Lyvers1,3, Dean P. Brown3,4, Ekaterina Poutrina3,4, Augustine M. 4 Urbas4, Thomas A. Germer5, and Vladimir P. Drachev1,2* 5 1 Department of Physics and Advance Materials Manufacturing Processing Institute, University of North 6 Texas, Denton, TX 76203, USA; kevin.roccapriore@my.unt.edu, walkingcub@gmail.com, 7 vladimir.drachev@unt.edu 8 2 Skolkovo Institute of Science and Technology, Moscow, 121205, Russia 9 3 UES, Inc., 4401 Dayton-Xenia Rd, Dayton, OH 45432, USA; dbrown@ues.com 10 4 Air Force Research Lab, Materials and Manufacturing Directorate, 3005 Hobson Way, Wright Patterson 11 AFB, OH 45433, USA; ekaterina.poutrina.ctr.ru@us.af.mil, augustine.urbas@wpafb.af.mil 12 5 Sensor Science Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, 13 MD 20899, USA; thomas.germer@nist.gov 14 * Correspondence: vladimir.drachev@unt.edu; Tel.: +1-940-565-4580 15

Research paper thumbnail of Designing hybrid lenses using metaoptics for enhanced optical performance

Metamaterials, Metadevices, and Metasystems 2021, 2021

Incorporating planar optics such as metalenses or metacorrectors into optical designs can drastic... more Incorporating planar optics such as metalenses or metacorrectors into optical designs can drastically improve the performance of imaging systems with additional benefits such as cost, size and weight improvements. However, modeling of such hybrid lenses is challenging because of the multiscale nature of the simulation. In this presentation, we show how to combine ray optic simulations with full wave simulations and Fourier optics approaches to model a whole compound lens considering all metasurface unit cell interactions and to study the effect of possible fabrication errors.

Research paper thumbnail of Waveguide Coupling via Magnetic Gratings with Effective Strips

Applied Sciences, 2018

Gratings with complex multilayer strips are studied under inclined incident light. Great interest... more Gratings with complex multilayer strips are studied under inclined incident light. Great interest in these gratings is due to applications as input/output tools for waveguides and as subwavelength metafilms. The structured strips introduce anisotropy in the effective parameters, providing additional flexibility in polarization and angular dependences of optical responses. Their characterization is challenging in the intermediate regime between subwavelength and diffractive modes. The transition between modes occurs at the Wood's anomaly wavelength, which is different at different angle of incidence. The usual characterization with an effective film using permittivity ε and permeability µ has limited effectiveness at normal incidence but does not apply at inclined illumination, due to the effect of periodicity. The optical properties are better characterized with effective medium strips instead of an effective medium layer to account for the multilayer strips and the underlying periodic nature of the grating. This approach is convenient for describing such intermediate gratings for two types of applications: both metafilms and the coupling of incident waves to waveguide modes or diffraction orders. The parameters of the effective strips are retrieved by matching the spectral-angular map at different incident angles.

Research paper thumbnail of Inherently Non-Reciprocal On The Nanoscale: Nonlinear Generation Via Multipole Interference

Frontiers in Optics 2016, 2016

Research paper thumbnail of Roadmap on optical metamaterials

Journal of Optics, 2016

Optical metamaterials have redefined how we understand light in notable ways: from strong respons... more Optical metamaterials have redefined how we understand light in notable ways: from strong response to optical magnetic fields, negative refraction, fast and slow light propagation in zero index and trapping structures, to flat, thin and perfect lenses. Many rules of thumb regarding optics, such as mu = 1, now have an exception, and basic formulas, such as the Fresnel equations, have been expanded. The field of metamaterials has developed strongly over the past two decades. Leveraging structured materials systems to generate tailored response to a stimulus, it has grown to encompass research in optics, electromagnetics, acoustics and, increasingly, novel hybrid materials responses. This roadmap is an effort to present emerging fronts in areas of optical metamaterials that could contribute and apply to other research communities. By anchoring each contribution in current work and prospectively discussing future potential and directions, the authors are translating the work of the field in selected areas to a wider community and offering an incentive for outside researchers to engage our community where solid links do not already exist.

Research paper thumbnail of Multipolar interference for non-reciprocal nonlinear generation

Research paper thumbnail of Deterministic Construction of Plasmonic Heterostructures in Well-Organized Arrays for Nanophotonic Materials

Research paper thumbnail of Multipolar analysis of linear and nonlinear unidirectional response from plasmonic dimers

CLEO: 2015, 2015

We develop the retrieval procedure for linear and nonlinear polarizabilities of plasmonic nanodim... more We develop the retrieval procedure for linear and nonlinear polarizabilities of plasmonic nanodimers and present examples of unidirectional scattering and nonlinear unidirectional generation from such geometries. Related effective parameters of periodic dimer arrangements are discussed.

Research paper thumbnail of Enhancing nonlinear response with metamaterials: from nonlinear parameters engineering to one-way imaging

We first summarize the approaches developed in our group allowing for the description of a nonlin... more We first summarize the approaches developed in our group allowing for the description of a nonlinear metamaterial media in terms of the effective nonlinear susceptibilities. We subsequently discuss the nonlinear magneto-electric coupling and demonstrate that it can lead to a non-reciprocal nonlinear imaging using a three-or four-wave mixing process, producing an image either on reflection or on transmission.

Research paper thumbnail of Three-wave mixing in microwave nonlinear metamaterial

CLEO:2011 - Laser Applications to Photonic Applications, 2011

ABSTRACT

Research paper thumbnail of Enhancing four-wave-mixing processes by nanowire arrays coupled to a gold film

Optics express, Jan 7, 2012

We consider the process of four-wave mixing in an array of gold nanowires strongly coupled to a g... more We consider the process of four-wave mixing in an array of gold nanowires strongly coupled to a gold film. Using full-wave simulations, we perform a quantitative comparison of the four-wave mixing efficiency associated with a bare film and films with nanowire arrays. We find that the strongly localized surface plasmon resonances of the coupled nanowires provide an additional local field enhancement that, along with the delocalized surface plasmon of the film, produces an overall four-wave mixing efficiency enhancement of up to six orders of magnitude over that of the bare film. The enhancement occurs over a wide range of excitation angles. The film-coupled nanowire array is easily amenable to nanofabrication, and could find application as an ultra-compact component for integrated photonic and quantum optic systems.

Research paper thumbnail of Controlling Nonlinearity with Structured Metamaterials

Nonlinear Optics, 2011

... David R. Smith, Ekaterina Poutrina, Da Huang, Alec Rose, Stephane Larouche Center forMetamate... more ... David R. Smith, Ekaterina Poutrina, Da Huang, Alec Rose, Stephane Larouche Center forMetamaterials and Integrated Plasmonics and Electrical and Computer Engineering, Duke University, Box 90291, Durham, NC, 27708 USA Author e-mail address: drsmith@ee.duke.edu ...

Research paper thumbnail of Nonlinear parameter retrieval from three- and four-wave mixing in metamaterials

Physical Review E, 2010

We present a generalized nonlinear susceptibility retrieval method for metamaterials based on tra... more We present a generalized nonlinear susceptibility retrieval method for metamaterials based on transfer matrices and valid in the nondepleted pump approximation. We construct a general formalism to describe the transfer matrix method for nonlinear media and apply it to the processes of three-and four-wave mixing. The accuracy of this approach is verified via finite element simulations. The method is then reversed to give a set of equations for retrieving the nonlinear susceptibility. Finally, we apply the proposed retrieval operation to a three-wave mixing transmission experiment performed on a varactor loaded split ring resonator metamaterial sample and find quantitative agreement with an analytical effective medium theory model.

Research paper thumbnail of Origin of second-harmonic generation enhancement in optical split-ring resonators

Physical Review B, 2012

We present a study of the second-order nonlinear optical properties of metal-based metamaterials.... more We present a study of the second-order nonlinear optical properties of metal-based metamaterials. A hydrodynamic model for electronic response is used, in which nonlinear surface contributions are expressed in terms of the bulk polarization. The model is in good agreement with published experimental results, and clarifies the mechanisms contributing to the nonlinear response. In particular, we show that the reported enhancement of second-harmonic in split-ring resonator based media is driven by the electric rather than the magnetic properties of the structure.

Research paper thumbnail of Second-harmonic generation in metallic nanoparticles: Clarification of the role of the surface

Physical Review B, 2012

The public reporting burden for this collection of information is estimated to average 1 hour per... more The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggesstions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports,

Research paper thumbnail of Nonlinear magnetoelectric metamaterials: Analysis and homogenization via a microscopic coupled-mode theory

Physical Review A, 2012

Artificially structured metamaterials hybridized with elements that respond nonlinearly to incide... more Artificially structured metamaterials hybridized with elements that respond nonlinearly to incident electromagnetic fields can, from a macroscopic perspective, support nonlinear responses that cannot be described by purely electric or magnetic interactions. To investigate the mechanisms and behaviors of such interactions, termed nonlinear magnetoelectric coupling, we develop a set of coupled-mode equations for describing three-wave mixing in a metamaterial, using Bloch modes as the basis. By equating these coupled-mode equations to those of a homogenized system, we derive closed-form expressions for the macroscopic nonlinear susceptibilities. From these expressions, a great deal can be inferred about the nature and construction of magnetoelectric nonlinearities in metamaterials. As an example, we apply this method in the analysis of a prototypical nonlinear magnetoelectric metamaterial. In particular, we show that independent control of the eight second-order susceptibility tensors encompasses a massive parameter space from which new realms of nonlinear interference and wave manipulation can be accessed.

Research paper thumbnail of Nonlinear oscillator metamaterial model: numerical and experimental verification

Optics Express, 2011

We verify numerically and experimentally the accuracy of an analytical model used to derive the e... more We verify numerically and experimentally the accuracy of an analytical model used to derive the effective nonlinear susceptibilities of a varactor-loaded split ring resonator (VLSRR) magnetic medium. For the numerical validation, a nonlinear oscillator model for the effective magnetization of the metamaterial is applied in conjunction with Maxwell equations and the two sets of equations solved numerically in the timedomain. The computed second harmonic generation (SHG) from a slab of a nonlinear material is then compared with the analytical model. The computed SHG is in excellent agreement with that predicted by the analytical model, both in terms of magnitude and spectral characteristics. Moreover, experimental measurements of the power transmitted through a fabricated VLSRR metamaterial at several power levels are also in agreement with the model, illustrating that the effective medium techniques associated with metamaterials can accurately be transitioned to nonlinear systems.

Research paper thumbnail of Forward and backward unidirectional scattering from plasmonic coupled wires

Optics Express, 2013

We analyze the resonant electromagnetic response of subwavelength plasmonic dimers formed by two ... more We analyze the resonant electromagnetic response of subwavelength plasmonic dimers formed by two silver strips separated by a thin dielectric spacer and embedded in a uniform dielectric media. We demonstrate that the off-resonant electric and resonant, geometric shape-leveraged, magnetic polarizabilities of the dimer element can be designed to have close absolute values in a certain spectral range, resulting in a predominantly unidirectional scattering of the incident field due to pronounced magneto-electric interference. Switching between forward and backward directionality can be achieved with a single element by changing the excitation wavelength, with the scattering direction defined by the relative phases of the polarizabilities. We extend the analysis to some periodic configurations, including the specific case of a perforated metal film, and discuss the differences between the observed unidirectional scattering and the extraordinary transmission effect. The unidirectional response can be preserved and enhanced with periodic arrays of dimers and can find applications in nanoantenna devices, integrated optic circuits, sensors with nanoparticles, photovoltaic systems, or perfect absorbers; while the option of switching between forward and backward unidirectional scattering may create interesting possibilities for manipulating optical pressure forces.

Research paper thumbnail of Surfaces, films, and multilayers for compact nonlinear plasmonics

Journal of the Optical Society of America B, 2013

ABSTRACT