Steven E Kooi | Massachusetts Institute of Technology (MIT) (original) (raw)

Papers by Steven E Kooi

Research paper thumbnail of Novel environmentally-safe, non-toxic, and supply-chain-resilient biomaterials for optical detection of molecules

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Research paper thumbnail of Alignment and Reordering of a Block Copolymer by Solvent-Enhanced Laser Thermal Direct Write

Bulletin of the American Physical Society, Mar 5, 2014

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Research paper thumbnail of Observation of enhanced free-electron radiation from photonic flatband resonances

arXiv (Cornell University), Oct 7, 2021

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Research paper thumbnail of 3D Micro- and Nanostructures via Interference Lithography

Advanced Functional Materials, Oct 5, 2007

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Research paper thumbnail of Additive Laser Excitation of Giant Nonlinear Surface Acoustic Wave Pulses

arXiv (Cornell University), Sep 28, 2022

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Research paper thumbnail of 3D-Printed Topology-Optimized Metaoptics

Conference on Lasers and Electro-Optics, 2020

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Research paper thumbnail of Extreme Plastic Deformation of Glassy Polymer Thin Films at Ballistic Strain Rates

Bulletin of the American Physical Society, Mar 7, 2018

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Research paper thumbnail of The Parametric Study of Focused Laser-Induced Marangoni Dewetting for Patterning Polymer Thin Films

Bulletin of the American Physical Society, Mar 14, 2016

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Research paper thumbnail of Ionization Dynamics of Transition Metal - Carbon Clusters

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Research paper thumbnail of Plasmonic Ag nanostructures on thin substrates for enhanced energy harvesting

Proceedings of SPIE, Sep 18, 2013

ABSTRACT Nanoparticles and nanostructures with plasmonic resonances are currently being employed ... more ABSTRACT Nanoparticles and nanostructures with plasmonic resonances are currently being employed to enhance the efficiency of solar cells. Ag stripe arrays have been shown theoretically to enhance the short-circuit current of thin silicon layers. Such Ag stripes are combined with 200 nm long and 60 nm wide "teeth", which act as nanoantennas, and form vertical rectifying metal-insulator-metal (MIM) nanostructures on metallic substrates coated with thin oxides, such as Nb/NbOx films. We characterize experimentally and theoretically the visible and near-infrared spectra of these "stripeteeth" arrays, which act as microantenna arrays for energy harvesting and detection, on silicon substrates. Modeling the stripe-teeth arrays predicts a substantial net a.c. voltage across the MIM diode, even when the stripe-teeth microrectenna arrays are illuminated at normal incidence.

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Research paper thumbnail of Elektrochemische Modifizierung einzelner Kohlenstoff-Nanoröhren Diese Arbeit wurde von der Europäischen Union (Projektnummer HPRN-CT-1999-00011) unterstützt. Die Autoren danken B. Siegle, Max-Planck-Institut für Metallforschung, Stuttgart, für die Unterstützung bei der Aufnahme der Auger-Spektren

Angewandte Chemie, Apr 15, 2002

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Research paper thumbnail of Spectrally and Spatially Resolved Smith-Purcell Radiation in Plasmonic Crystals with Short-Range Disorder

Physical Review X, Jan 17, 2017

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Research paper thumbnail of Emission Color Tuning with Polymer Molecular Weight for Difluoroboron Dibenzoylmethane-Polylactide

Advanced Materials, Jun 4, 2008

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Research paper thumbnail of Corrigendum: Focused laser-induced marangoni dewetting for patterning polymer thin films

Journal of Polymer Science Part B, Feb 6, 2017

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Research paper thumbnail of Solar metadevice with enhanced absorption, scattering, and spectral control

Lightweight, portable solar blankets, constructed from thin film photovoltaics, are of great inte... more Lightweight, portable solar blankets, constructed from thin film photovoltaics, are of great interest to hikers, the military, first responders, and third-world countries lacking infrastructure for transporting heavy, brittle solar cells. These solar blankets, as large as two square meters in area, come close to satisfying specifications for commercial and military use, but they still have limited absorption due to insufficient material efficiency, and therefore are large and too heavy in many cases. Metasurfaces, consisting of monolayers of periodic and semi-random plasmonic particles patterned in a scalable manner, are explored to enhance scattering into thin photovoltaic films (currently of significant commercial and military value), in order to enhance absorption and efficiency of solar blankets. Without nano-enhancement, absorption is limited by the thickness of the thin photovoltaic active layer in the long-wavelength region. In this study, lithographically patterned, periodic Al nanostructure arrays demonstrate experimentally a large absorption enhancement, resulting in a predicted increase in short-circuit current density of at least 35% and as much as 70% for optimized arrays atop 200-nm amorphous silicon thin films. Optimized arrays extend thin-film absorption to the near infrared region. This impressive absorption enhancement and predicted increase in short-circuit current density may significantly increase the efficiency and reduce the weight of solar blankets, enabling their use for commercial and military applications.

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Research paper thumbnail of High-order Smith-Purcell radiation in Silicon Nanowires

Conference on Lasers and Electro-Optics, 2017

We present experimental results demonstrating multiple order Smith-Purcell radiation in high aspe... more We present experimental results demonstrating multiple order Smith-Purcell radiation in high aspect ratio Silicon Nanowires structures using low-energy electrons (2.5–10keV). These produce emission spanning the visible, paving the way to a fully tunable ultraviolet source.

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Research paper thumbnail of Energy Disposal in the Photodissociation of Co(CO)<sub>3</sub>NO near 225 nm

Journal of Physical Chemistry A, Dec 1, 1998

ABSTRACT The photodissociation of Co(CO)3NO was studied near 225 nm. Apparent two-photon dissocia... more ABSTRACT The photodissociation of Co(CO)3NO was studied near 225 nm. Apparent two-photon dissociation of the parent compound produces Co* in a number of excited states that emit in the range of 340−360 nm. Both quartet and doublet states of Co* are observed, implying the existence of spin-conserving and nonspin-conserving dissociation channels. Assignment of the Co* emission is used to calculate an upper limit for the average metal−ligand bond dissociation energy of 36.2−38.6 kcal/mol with no spin-conservation restrictions and 41.2−43.9 kcal/mol with spin-conservation restrictions. The Co* emission intensities are used to determine the relative populations of particular J and spin states and to demonstrate that J states within a particular LS configuration are statistically populated. The NO photoproduct was detected by fluorescence excitation spectroscopy. The NO appears to follow dual Boltzmann statistics with rotational temperatures of 580 ± 70 K for Erot &lt; 500 cm-1 and 2800 ± 300 K for Erot &gt; 500 cm-1.

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Research paper thumbnail of Relaxation Dynamics of Electronically Excited Nanoscale Metal−Carbon Complexes: Vanadium−Carbon Clusters

Nano Letters, Feb 20, 2001

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Research paper thumbnail of Maximal spontaneous photon emission and energy loss from free electrons

Nature Physics, Jul 16, 2018

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Research paper thumbnail of Multi-Emissive Difluoroboron Dibenzoylmethane Polylactide Exhibiting Intense Fluorescence and Oxygen-Sensitive Room-Temperature Phosphorescence

Journal of the American Chemical Society, Jul 1, 2007

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Research paper thumbnail of Novel environmentally-safe, non-toxic, and supply-chain-resilient biomaterials for optical detection of molecules

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Alignment and Reordering of a Block Copolymer by Solvent-Enhanced Laser Thermal Direct Write

Bulletin of the American Physical Society, Mar 5, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Observation of enhanced free-electron radiation from photonic flatband resonances

arXiv (Cornell University), Oct 7, 2021

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Research paper thumbnail of 3D Micro- and Nanostructures via Interference Lithography

Advanced Functional Materials, Oct 5, 2007

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Research paper thumbnail of Additive Laser Excitation of Giant Nonlinear Surface Acoustic Wave Pulses

arXiv (Cornell University), Sep 28, 2022

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Research paper thumbnail of 3D-Printed Topology-Optimized Metaoptics

Conference on Lasers and Electro-Optics, 2020

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Research paper thumbnail of Extreme Plastic Deformation of Glassy Polymer Thin Films at Ballistic Strain Rates

Bulletin of the American Physical Society, Mar 7, 2018

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Research paper thumbnail of The Parametric Study of Focused Laser-Induced Marangoni Dewetting for Patterning Polymer Thin Films

Bulletin of the American Physical Society, Mar 14, 2016

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Research paper thumbnail of Ionization Dynamics of Transition Metal - Carbon Clusters

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Plasmonic Ag nanostructures on thin substrates for enhanced energy harvesting

Proceedings of SPIE, Sep 18, 2013

ABSTRACT Nanoparticles and nanostructures with plasmonic resonances are currently being employed ... more ABSTRACT Nanoparticles and nanostructures with plasmonic resonances are currently being employed to enhance the efficiency of solar cells. Ag stripe arrays have been shown theoretically to enhance the short-circuit current of thin silicon layers. Such Ag stripes are combined with 200 nm long and 60 nm wide &quot;teeth&quot;, which act as nanoantennas, and form vertical rectifying metal-insulator-metal (MIM) nanostructures on metallic substrates coated with thin oxides, such as Nb/NbOx films. We characterize experimentally and theoretically the visible and near-infrared spectra of these &quot;stripeteeth&quot; arrays, which act as microantenna arrays for energy harvesting and detection, on silicon substrates. Modeling the stripe-teeth arrays predicts a substantial net a.c. voltage across the MIM diode, even when the stripe-teeth microrectenna arrays are illuminated at normal incidence.

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Research paper thumbnail of Elektrochemische Modifizierung einzelner Kohlenstoff-Nanoröhren Diese Arbeit wurde von der Europäischen Union (Projektnummer HPRN-CT-1999-00011) unterstützt. Die Autoren danken B. Siegle, Max-Planck-Institut für Metallforschung, Stuttgart, für die Unterstützung bei der Aufnahme der Auger-Spektren

Angewandte Chemie, Apr 15, 2002

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Research paper thumbnail of Spectrally and Spatially Resolved Smith-Purcell Radiation in Plasmonic Crystals with Short-Range Disorder

Physical Review X, Jan 17, 2017

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Research paper thumbnail of Emission Color Tuning with Polymer Molecular Weight for Difluoroboron Dibenzoylmethane-Polylactide

Advanced Materials, Jun 4, 2008

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Research paper thumbnail of Corrigendum: Focused laser-induced marangoni dewetting for patterning polymer thin films

Journal of Polymer Science Part B, Feb 6, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solar metadevice with enhanced absorption, scattering, and spectral control

Lightweight, portable solar blankets, constructed from thin film photovoltaics, are of great inte... more Lightweight, portable solar blankets, constructed from thin film photovoltaics, are of great interest to hikers, the military, first responders, and third-world countries lacking infrastructure for transporting heavy, brittle solar cells. These solar blankets, as large as two square meters in area, come close to satisfying specifications for commercial and military use, but they still have limited absorption due to insufficient material efficiency, and therefore are large and too heavy in many cases. Metasurfaces, consisting of monolayers of periodic and semi-random plasmonic particles patterned in a scalable manner, are explored to enhance scattering into thin photovoltaic films (currently of significant commercial and military value), in order to enhance absorption and efficiency of solar blankets. Without nano-enhancement, absorption is limited by the thickness of the thin photovoltaic active layer in the long-wavelength region. In this study, lithographically patterned, periodic Al nanostructure arrays demonstrate experimentally a large absorption enhancement, resulting in a predicted increase in short-circuit current density of at least 35% and as much as 70% for optimized arrays atop 200-nm amorphous silicon thin films. Optimized arrays extend thin-film absorption to the near infrared region. This impressive absorption enhancement and predicted increase in short-circuit current density may significantly increase the efficiency and reduce the weight of solar blankets, enabling their use for commercial and military applications.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of High-order Smith-Purcell radiation in Silicon Nanowires

Conference on Lasers and Electro-Optics, 2017

We present experimental results demonstrating multiple order Smith-Purcell radiation in high aspe... more We present experimental results demonstrating multiple order Smith-Purcell radiation in high aspect ratio Silicon Nanowires structures using low-energy electrons (2.5–10keV). These produce emission spanning the visible, paving the way to a fully tunable ultraviolet source.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Energy Disposal in the Photodissociation of Co(CO)<sub>3</sub>NO near 225 nm

Journal of Physical Chemistry A, Dec 1, 1998

ABSTRACT The photodissociation of Co(CO)3NO was studied near 225 nm. Apparent two-photon dissocia... more ABSTRACT The photodissociation of Co(CO)3NO was studied near 225 nm. Apparent two-photon dissociation of the parent compound produces Co* in a number of excited states that emit in the range of 340−360 nm. Both quartet and doublet states of Co* are observed, implying the existence of spin-conserving and nonspin-conserving dissociation channels. Assignment of the Co* emission is used to calculate an upper limit for the average metal−ligand bond dissociation energy of 36.2−38.6 kcal/mol with no spin-conservation restrictions and 41.2−43.9 kcal/mol with spin-conservation restrictions. The Co* emission intensities are used to determine the relative populations of particular J and spin states and to demonstrate that J states within a particular LS configuration are statistically populated. The NO photoproduct was detected by fluorescence excitation spectroscopy. The NO appears to follow dual Boltzmann statistics with rotational temperatures of 580 ± 70 K for Erot &lt; 500 cm-1 and 2800 ± 300 K for Erot &gt; 500 cm-1.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Relaxation Dynamics of Electronically Excited Nanoscale Metal−Carbon Complexes: Vanadium−Carbon Clusters

Nano Letters, Feb 20, 2001

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Research paper thumbnail of Maximal spontaneous photon emission and energy loss from free electrons

Nature Physics, Jul 16, 2018

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Research paper thumbnail of Multi-Emissive Difluoroboron Dibenzoylmethane Polylactide Exhibiting Intense Fluorescence and Oxygen-Sensitive Room-Temperature Phosphorescence

Journal of the American Chemical Society, Jul 1, 2007

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