Ilya Shadrivov | The Australian National University (original) (raw)
Papers by Ilya Shadrivov
Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, 2008
ABSTRACT
2007 IEEE Antennas and Propagation International Symposium, 2007
ABSTRACT In this paper, we investigate both theoretically and experimentally, the situation that ... more ABSTRACT In this paper, we investigate both theoretically and experimentally, the situation that exists when magnetoinductive waves are efficiently generated in uniaxial composite metamaterial structures composed of SRRs. We excite a slab of a magnetic metamaterial using a monopole antenna and analyze the beam structure behind the slab. Although the scale of the composite constituents are much smaller then the wavelength of radiation, we observe that an approximation based on an effective medium fails to describe all observed effects, including the multiple beam splitting. We develop a numerical algorithm for describing the lattices of SRRs in terms of interacting dipoles, and confirm qualitatively the effects observed in experiments.
Photonics and Nanostructures - Fundamentals and Applications, 2006
We describe novel physics of nonlinear magnetoinductive waves in left-handed composite metamateri... more We describe novel physics of nonlinear magnetoinductive waves in left-handed composite metamaterials. We derive the coupled equations for describing the propagation of magnetoinductive waves, and show that in the nonlinear regime the magnetic response of a metamaterial may become bistable. We analyze modulational instability of different nonlinear states, and also demonstrate that nonlinear metamaterials may support the propagation of domain walls (kinks) connecting the regions with the positive and negative magnetization. #
CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009
Subwavelength confinement and manipulation of light is of a great importance for imaging, sensing... more Subwavelength confinement and manipulation of light is of a great importance for imaging, sensing, high- resolution lithography, all-optical signal processing, as well as photonic funnels and superlenses. The diffraction limit, however, prevents such a confinement of optical radiation to the dimensions smaller than one half of the wavelength in the material. Conventional resolution-improvement techniques are based on high-index materials, and
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 2006
We outline specific features of numerical simulations of metamaterial wedges and interfaces. We s... more We outline specific features of numerical simulations of metamaterial wedges and interfaces. We study the effect of different positioning of a grid in the Yee method, which is necessary to obtain consistent convergence in modelling of interfaces with metamaterials characterized by negative dielectric permittivity and negative magnetic permeability. We demonstrate however that, in the framework of the continuousmedium approximation, wave scattering on the wedge may result in a resonant excitation of waves with infinitely large spatial frequencies, leading to non-convergence of the simulation results that depend on the discretization step.
Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, 2004
ABSTRACT
Nonlinear Guided Waves and Their Applications, 2002
Photonic Metamaterials: From Random to Periodic, 2006
Abstract: We analyze the effect of microscopic disorder on macroscopic properties of composite me... more Abstract: We analyze the effect of microscopic disorder on macroscopic properties of composite metamaterials; we study how weak, statistically independent fluctuations of the parameters of the structure elements modify their collective magnetic response and left-handed ...
Optics Communications, 2003
We develop the analytical method of field momenta for analyzing the dynamics of optical vector so... more We develop the analytical method of field momenta for analyzing the dynamics of optical vector solitons in photorefractive nonlinear media. First, we derive the effective evolution equations for the parameters of multi-component solitons composed of incoherently coupled beams and investigate the soliton internal oscillations associated with the relative motion of the soliton components. Then, we apply this method for analyzing the vector soliton scattering by a nonlinear interface. In particular, we show that a vector soliton can be reflected, transmitted, captured, or split into separate components, depending on the initial energy of its internal degree of freedom. The results are verified by direct numerical simulations of spatial optical solitons in photorefractive nonlinear media.
2013 7th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, 2013
ABSTRACT We report our recent achievements in tuning metamaterials with light. We introduce a nov... more ABSTRACT We report our recent achievements in tuning metamaterials with light. We introduce a novel approach to design metamaterials with sign-varying nonlinear response. For this purpose, we use split-ring resonators loaded by photodiodes and varactor diodes. A non-monotonic frequency shift of the resonance frequency depending on incident microwave power is demonstrated. Finally, we show how the nonlinear response of photosensitive metamaterials can be directly controlled by light coupling.
Conference on Lasers and Electro-Optics 2010, 2010
We study two major nonlinear effects in plasmonic structures: second-harmonic generation in metal... more We study two major nonlinear effects in plasmonic structures: second-harmonic generation in metal-insulator-metal waveguides and self-focusing of plasmons propagating along an interface between metal and Kerr-type nonlinear dielectric with the formation of spatial plasmon-polariton solitons.
Optics Express, 2009
We present an erratum regarding the normalization of power flow in our paper.
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, 2013
ABSTRACT form only given. Recent studies have demonstrated that it is possible to modify the prop... more ABSTRACT form only given. Recent studies have demonstrated that it is possible to modify the properties of metamaterials by electromagnetic waves via inducing mechanical deformations of samples and therefore changing material properties. As an example, optical rotation of chiral particles was demonstrated [1], and a rich variety of nonlinear behaviour was achieved with magneto-elastic metamaterials [2]. The range of possible effects achievable in this way promises to be richer than in the prominent area of optomechanics, because the greater flexibility in metamaterial design overcomes the limits of available material functionalities, and offers wider possibilities for optimisation. At the same time, the implementation of magnetoelastic metamaterials [2] remains challenging and in some cases, such as the conformational nonlinearity in resonant spirals, remains inaccessible for optics. The reason for this is that the magnetic forces, employed in the initial designs, are relatively weak, so such materials require either high power or extremely small elastic restoring forces, which poses a considerable manufacturing challenge. We recall, however, that earlier research on structurally tunable metamaterials [3] indicated that near-field interaction may significantly improve the tunability range and leads to various effects associated with near-field coupling.Here, we extend earlier approaches and propose a new concept of torsional metamaterials, by exploiting rotation of structural elements. We expect that the most efficient approach to implement dynamic coupling between electromagnetic and mechanical effects should rely on near-field interaction where both the electric and magnetic fields are involved. Near-field effects can have a powerful influence even for subtle changes in the mutual orientation. Instead of a considerable displacement of an entire array, as required for quasi-static tuning, it is sufficient to move the crucial parts of the resonant particles with res- ect to each other - for example, the gaps of the two coupled split-ring resonators (see Fig. 1), which involves a more gentle geometric alteration. To describe the effect, we develop a theory based on near-field interaction to model coupled electromagnetic and mechanical properties of such system [3], and predict bistable behaviour. We fabricate a pair of split-ring resonators and perform a pump-probe microwave experiments. We measure the spectral response of the sample for different pump strength, see Fig. 2. The structure shows giant nonlinear resonance shift, and the predicted evolution from bistable to monotonic nonlinearity is clearly observed when the pump frequency approaches the initial resonance; the results show a good agreement with full wave numerical simulations. Our results demonstrate that a novel concept of torsional metamaterials is feasible, and it would allow creating metamaterial structures with giant nonlinearity and optical activity.
Reviews of Modern Physics, 2014
2010 International Conference on Electromagnetics in Advanced Applications, 2010
Metamaterials have highly complex constituent elements, typically consisting of sub-wavelength me... more Metamaterials have highly complex constituent elements, typically consisting of sub-wavelength metallic resonators. This gives rise to the exotic properties of metamaterials, but also creates challenges for modeling the structure. In addition, the engineered nature of the ...
Optics and Photonics News, 2011
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012
ABSTRACT
2013 7th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, 2013
ABSTRACT We develop a method for fabricating hyperbolic metamaterials for terahertz (THz) applica... more ABSTRACT We develop a method for fabricating hyperbolic metamaterials for terahertz (THz) applications. We prepare a porous silicon matrix with a triangular lattice of holes, which we fill with copper by means of electrochemical deposition. We study transmission properties of this wire medium using THz time-domain spectroscopy, and demonstrate hyperbolic media properties.
Metamaterials V, 2010
We discuss a novel tuning method based on continuous adjustment of metamaterial lattice parameter... more We discuss a novel tuning method based on continuous adjustment of metamaterial lattice parameters. This method provides for remarkable tuning of transmission characteristics through a subtle displacement of metamaterial layers. While the effective medium theory predicts correctly the general tuning characteristics, it turns out that the particular tuning pattern is determined by the peculiarities of near-field interaction between the metamaterial
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007
ABSTRACT
Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, 2008
ABSTRACT
2007 IEEE Antennas and Propagation International Symposium, 2007
ABSTRACT In this paper, we investigate both theoretically and experimentally, the situation that ... more ABSTRACT In this paper, we investigate both theoretically and experimentally, the situation that exists when magnetoinductive waves are efficiently generated in uniaxial composite metamaterial structures composed of SRRs. We excite a slab of a magnetic metamaterial using a monopole antenna and analyze the beam structure behind the slab. Although the scale of the composite constituents are much smaller then the wavelength of radiation, we observe that an approximation based on an effective medium fails to describe all observed effects, including the multiple beam splitting. We develop a numerical algorithm for describing the lattices of SRRs in terms of interacting dipoles, and confirm qualitatively the effects observed in experiments.
Photonics and Nanostructures - Fundamentals and Applications, 2006
We describe novel physics of nonlinear magnetoinductive waves in left-handed composite metamateri... more We describe novel physics of nonlinear magnetoinductive waves in left-handed composite metamaterials. We derive the coupled equations for describing the propagation of magnetoinductive waves, and show that in the nonlinear regime the magnetic response of a metamaterial may become bistable. We analyze modulational instability of different nonlinear states, and also demonstrate that nonlinear metamaterials may support the propagation of domain walls (kinks) connecting the regions with the positive and negative magnetization. #
CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009
Subwavelength confinement and manipulation of light is of a great importance for imaging, sensing... more Subwavelength confinement and manipulation of light is of a great importance for imaging, sensing, high- resolution lithography, all-optical signal processing, as well as photonic funnels and superlenses. The diffraction limit, however, prevents such a confinement of optical radiation to the dimensions smaller than one half of the wavelength in the material. Conventional resolution-improvement techniques are based on high-index materials, and
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 2006
We outline specific features of numerical simulations of metamaterial wedges and interfaces. We s... more We outline specific features of numerical simulations of metamaterial wedges and interfaces. We study the effect of different positioning of a grid in the Yee method, which is necessary to obtain consistent convergence in modelling of interfaces with metamaterials characterized by negative dielectric permittivity and negative magnetic permeability. We demonstrate however that, in the framework of the continuousmedium approximation, wave scattering on the wedge may result in a resonant excitation of waves with infinitely large spatial frequencies, leading to non-convergence of the simulation results that depend on the discretization step.
Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, 2004
ABSTRACT
Nonlinear Guided Waves and Their Applications, 2002
Photonic Metamaterials: From Random to Periodic, 2006
Abstract: We analyze the effect of microscopic disorder on macroscopic properties of composite me... more Abstract: We analyze the effect of microscopic disorder on macroscopic properties of composite metamaterials; we study how weak, statistically independent fluctuations of the parameters of the structure elements modify their collective magnetic response and left-handed ...
Optics Communications, 2003
We develop the analytical method of field momenta for analyzing the dynamics of optical vector so... more We develop the analytical method of field momenta for analyzing the dynamics of optical vector solitons in photorefractive nonlinear media. First, we derive the effective evolution equations for the parameters of multi-component solitons composed of incoherently coupled beams and investigate the soliton internal oscillations associated with the relative motion of the soliton components. Then, we apply this method for analyzing the vector soliton scattering by a nonlinear interface. In particular, we show that a vector soliton can be reflected, transmitted, captured, or split into separate components, depending on the initial energy of its internal degree of freedom. The results are verified by direct numerical simulations of spatial optical solitons in photorefractive nonlinear media.
2013 7th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, 2013
ABSTRACT We report our recent achievements in tuning metamaterials with light. We introduce a nov... more ABSTRACT We report our recent achievements in tuning metamaterials with light. We introduce a novel approach to design metamaterials with sign-varying nonlinear response. For this purpose, we use split-ring resonators loaded by photodiodes and varactor diodes. A non-monotonic frequency shift of the resonance frequency depending on incident microwave power is demonstrated. Finally, we show how the nonlinear response of photosensitive metamaterials can be directly controlled by light coupling.
Conference on Lasers and Electro-Optics 2010, 2010
We study two major nonlinear effects in plasmonic structures: second-harmonic generation in metal... more We study two major nonlinear effects in plasmonic structures: second-harmonic generation in metal-insulator-metal waveguides and self-focusing of plasmons propagating along an interface between metal and Kerr-type nonlinear dielectric with the formation of spatial plasmon-polariton solitons.
Optics Express, 2009
We present an erratum regarding the normalization of power flow in our paper.
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, 2013
ABSTRACT form only given. Recent studies have demonstrated that it is possible to modify the prop... more ABSTRACT form only given. Recent studies have demonstrated that it is possible to modify the properties of metamaterials by electromagnetic waves via inducing mechanical deformations of samples and therefore changing material properties. As an example, optical rotation of chiral particles was demonstrated [1], and a rich variety of nonlinear behaviour was achieved with magneto-elastic metamaterials [2]. The range of possible effects achievable in this way promises to be richer than in the prominent area of optomechanics, because the greater flexibility in metamaterial design overcomes the limits of available material functionalities, and offers wider possibilities for optimisation. At the same time, the implementation of magnetoelastic metamaterials [2] remains challenging and in some cases, such as the conformational nonlinearity in resonant spirals, remains inaccessible for optics. The reason for this is that the magnetic forces, employed in the initial designs, are relatively weak, so such materials require either high power or extremely small elastic restoring forces, which poses a considerable manufacturing challenge. We recall, however, that earlier research on structurally tunable metamaterials [3] indicated that near-field interaction may significantly improve the tunability range and leads to various effects associated with near-field coupling.Here, we extend earlier approaches and propose a new concept of torsional metamaterials, by exploiting rotation of structural elements. We expect that the most efficient approach to implement dynamic coupling between electromagnetic and mechanical effects should rely on near-field interaction where both the electric and magnetic fields are involved. Near-field effects can have a powerful influence even for subtle changes in the mutual orientation. Instead of a considerable displacement of an entire array, as required for quasi-static tuning, it is sufficient to move the crucial parts of the resonant particles with res- ect to each other - for example, the gaps of the two coupled split-ring resonators (see Fig. 1), which involves a more gentle geometric alteration. To describe the effect, we develop a theory based on near-field interaction to model coupled electromagnetic and mechanical properties of such system [3], and predict bistable behaviour. We fabricate a pair of split-ring resonators and perform a pump-probe microwave experiments. We measure the spectral response of the sample for different pump strength, see Fig. 2. The structure shows giant nonlinear resonance shift, and the predicted evolution from bistable to monotonic nonlinearity is clearly observed when the pump frequency approaches the initial resonance; the results show a good agreement with full wave numerical simulations. Our results demonstrate that a novel concept of torsional metamaterials is feasible, and it would allow creating metamaterial structures with giant nonlinearity and optical activity.
Reviews of Modern Physics, 2014
2010 International Conference on Electromagnetics in Advanced Applications, 2010
Metamaterials have highly complex constituent elements, typically consisting of sub-wavelength me... more Metamaterials have highly complex constituent elements, typically consisting of sub-wavelength metallic resonators. This gives rise to the exotic properties of metamaterials, but also creates challenges for modeling the structure. In addition, the engineered nature of the ...
Optics and Photonics News, 2011
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012
ABSTRACT
2013 7th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, 2013
ABSTRACT We develop a method for fabricating hyperbolic metamaterials for terahertz (THz) applica... more ABSTRACT We develop a method for fabricating hyperbolic metamaterials for terahertz (THz) applications. We prepare a porous silicon matrix with a triangular lattice of holes, which we fill with copper by means of electrochemical deposition. We study transmission properties of this wire medium using THz time-domain spectroscopy, and demonstrate hyperbolic media properties.
Metamaterials V, 2010
We discuss a novel tuning method based on continuous adjustment of metamaterial lattice parameter... more We discuss a novel tuning method based on continuous adjustment of metamaterial lattice parameters. This method provides for remarkable tuning of transmission characteristics through a subtle displacement of metamaterial layers. While the effective medium theory predicts correctly the general tuning characteristics, it turns out that the particular tuning pattern is determined by the peculiarities of near-field interaction between the metamaterial
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007
ABSTRACT