National Research University for Information Technology

Saint Petersburg, Russia

National Research University for Information Technology

Saint Petersburg, Russia
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Uskov A.V.,Wuhan University | Uskov A.V.,CAS Institute of Physics | Protsenko I.E.,RAS Lebedev Physical Institute | Ikhsanov R.S.,Research Institute of Scientific Instruments | And 6 more authors.
Optics InfoBase Conference Papers | Year: 2014

We theoretically compare surface- and volume-based photoelectron emission from spherical nanoparticles, obtaining analytical expressions for the emission rate in both mechanisms. We show that the surface mechanism prevails, being unaffected by detrimental hot electron collisions. © 2014 OSA.


Uskov A.V.,Wuhan University of Technology | Uskov A.V.,CAS Institute of Physics | Protsenko I.E.,RAS Lebedev Physical Institute | Ikhsanov R.S.,RAS Institute for Nuclear Research | And 8 more authors.
Nanoscale | Year: 2014

We study the emission of photoelectrons from plasmonic nanoparticles into a surrounding matrix. We consider two mechanisms of electron emission from the nanoparticles-surface and volume ones-and use models for these two mechanisms which allow us to obtain analytical results for the photoelectron emission rate from a nanoparticle. Calculations have been carried out for a step potential at the surface of a spherical nanoparticle, and a simple model for the hot electron cooling has been used. We highlight the effect of the discontinuity of the dielectric permittivity at the nanoparticle boundary in the surface mechanism, which leads to a substantial (by ∼5 times) increase of the internal photoelectron emission rate from a nanoparticle compared to the case when such a discontinuity is absent. For a plasmonic nanoparticle, a comparison of the two photoeffect mechanisms was undertaken for the first time which showed that the surface photoeffect can in the general case be larger than the volume one, which agrees with the results obtained for a flat metal surface first formulated by Tamm and Schubin in their pioneering development of a quantum-mechanical theory of photoeffect in 1931. In accordance with our calculations, this possible predominance of the surface effect is based on two factors: (i) effective cooling of hot carriers during their propagation from the volume of the nanoparticle to its surface in the scenario of the volume mechanism and (ii) strengthening of the surface mechanism through the effect of the discontinuity of the dielectric permittivity at the nanoparticle boundary. The latter is stronger at relatively lower photon energies and correspondingly is more substantial for internal photoemission than for an external one. We show that in the general case, it is essential to take both mechanisms into account in the development of devices based on the photoelectric effect and when considering hot electron emission from a plasmonic nanoantenna. © 2014 the Partner Organisations.


Uskov A.V.,Wuhan University | Uskov A.V.,CAS Institute of Physics | Protsenko I.E.,RAS Lebedev Physical Institute | Ikhsanov R.Sh.,Research Institute of Scientific Instruments | And 7 more authors.
Conference on Lasers and Electro-Optics Europe - Technical Digest | Year: 2014

We theoretically compare surface- and volume-based photoelectron emission from spherical nanoparticles, obtaining analytical expressions for the emission rate in both mechanisms. We show that the surface mechanism prevails, being unaffected by detrimental hot electron collisions. © 2014 Optical Society of America.


Ishii S.,Purdue University | Ishii S.,Japan International Center for Materials Nanoarchitectonics | Shalaginov M.Y.,Purdue University | Babicheva V.E.,Purdue University | And 5 more authors.
Optics Letters | Year: 2014

Strongly anisotropic media with hyperbolic dispersion can be used for claddings of plasmonic waveguides (PWs). In order to analyze the fundamental properties of such waveguides, we analytically study 1D waveguides arranged from a hyperbolic metamaterial (HMM) in a HMM-Insulator-HMM (HIH) structure. We show that HMM claddings give flexibility in designing the properties of HIH waveguides. Our comparative study on 1D PWs reveals that HIHtype waveguides can have a higher performance than MIM or IMI waveguides. © 2014 Optical Society of America.


Hopkins B.,Australian National University | Poddubny A.N.,RAS Ioffe Physical - Technical Institute | Miroshnichenko A.E.,Australian National University | Kivshar Y.S.,Australian National University | Kivshar Y.S.,National Research University for Information Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We present a robust approach for interpreting the physics of Fano resonances in planar oligomer structures of both metallic and dielectric nanoparticles. We reveal a key mechanism for Fano resonances by demonstrating that such resonances can be generated purely from the interference of nonorthogonal collective eigenmodes, which are clearly identified based on the coupled-dipole approximation. We prove analytically a general theorem to identify the number of collective eigenmodes that can be excited in ring-type nanoparticle oligomers and further demonstrate that no dark-mode excitation is necessary for the existence of Fano resonances in symmetric oligomers. As a consequence, we unify the understanding of Fano resonances for both plasmonic and all-dielectric oligomers. © 2013 American Physical Society.


Hopkins B.,Australian National University | Poddubny A.N.,RAS Ioffe Physical - Technical Institute | Miroshnichenko A.E.,Australian National University | Kivshar Y.S.,Australian National University | Kivshar Y.S.,National Research University for Information Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Here we present a general approach for describing the physics of Fano resonances in nanoparticle oligomers. It is shown that the interference of nonorthogonal collective eigenmodes is a sufficient condition to produce Fano resonances. We then show that such nonorthogonality between eigenmodes also permits the existence of a new form circular dichroism in the absorption and scattering cross-sections, even when circular dichroism is forbidden in the extinction cross-section. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. © 2015 SPIE.


Poddubny A.N.,RAS Ioffe Physical - Technical Institute | Belov P.A.,National Research University for Information Technology | Kivshar Y.S.,Australian National University
Physical Review B - Condensed Matter and Materials Physics | Year: 2013

We study theoretically the enhancement of spontaneous emission in wire metamaterials. We analyze the dependence of the Purcell factor on the wire dielectric constant for both electric and magnetic dipole sources and find an optimal value of the dielectric constant for maximizing the Purcell factor for the electric dipole. We obtain analytical expressions for the Purcell factor and also provide estimates for the Purcell factor in realistic structures operating in both microwave and optical spectral ranges. © 2013 American Physical Society.


Hopkins B.,Australian National University | Poddubny A.N.,RAS Ioffe Physical - Technical Institute | Miroshnichenko A.E.,Australian National University | Kivshar Y.S.,Australian National University | Kivshar Y.S.,National Research University for Information Technology
Laser and Photonics Reviews | Year: 2016

We present a general theory of circular dichroism in planar chiral nanostructures with rotational symmetry. It is demonstrated, analytically, that the handedness of the incident field's polarization can control whether a nanostructure induces either absorption or scattering losses, even when the total optical loss (extinction) is polarization-independent. We show that this effect is a consequence of modal interference so that strong circular dichroism in absorption and scattering can be engineered by combining Fano resonances with planar chiral nanoparticle clusters. The energy imparted by circularly polarized light on chiral matter is known to depend on the handedness of light; an effect known as a circular dichroism. This study reveals that an analogous effect can be realized in two-dimensional, planar chiral, nanostructures through a form of circular dichroism in far-field radiation and near-field material absorption that originates from Fano-like modal interference. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA.


Hopkins B.,Australian National University | Poddubny A.E.,RAS Ioffe Physical - Technical Institute | Miroshnichenko A.E.,Australian National University | Kivshar Y.S.,Australian National University | Kivshar Y.S.,National Research University for Information Technology
Frontiers in Optics, FiO 2014 | Year: 2014

The regime of strong coupling is often avoided when designing nanoparticle scattering systems. Here we show that discrete rotational symmetry enables simple mode analysis of such systems, allowing design of chiral interference and Fano resonances. © OSA 2014.


Babicheva V.E.,Technical University of Denmark | Babicheva V.E.,National Research University for Information Technology | Zhukovsky S.V.,Technical University of Denmark | Zhukovsky S.V.,National Research University for Information Technology | Lavrinenko A.V.,Technical University of Denmark
2014 8th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2014 | Year: 2014

We propose and investigate several layouts of metal-insulator-metal waveguide with active core which can be utilized for dynamic switching in photonic integrated circuits. The active material, bismuth ferrite (BiFeO3), is sandwiched between metal plates and changes its refractive index through partial switching of ferroelectric domain orientation under applied voltage. Both phase and amplitude modulations are envisaged. © 2014 IEEE.

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