Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Reddy, K. Nireekshan"'
We employ transformation optics to study analytically nonlinear wave mixing from a singular geometry of touching plasmonic wires. We obtain the analytic solution of the near-field and complement it with a solution of the far-field properties. We find
Externí odkaz:
http://arxiv.org/abs/2011.08662
Autor:
Elkabetz, Shimon, Reddy, K. Nireekshan, Chen, Parry Y., andez-Domnguez, Antonio I. Fern, Sivan, Yonatan
Publikováno v:
Phys. Rev. B 103, 075411 (2021)
We employ transformation optics to optimize the generic nonlinear wave interaction of second-harmonic generation from a pair of touching metallic wires. We demonstrate a 10 orders of magnitude increase in the second-harmonic scattering cross-section
Externí odkaz:
http://arxiv.org/abs/2011.05640
Surface second-harmonic from metallic nanoparticle configurations - a transformation optics approach
Publikováno v:
Phys. Rev. B 99, 235429 (2019)
We study surface second-harmonic generation (SHG) from a singular plasmonic structure consisting of touching metallic wires. We use the technique of transformation optics and relate the structure to a rather simpler geometry, a slab waveguide. This a
Externí odkaz:
http://arxiv.org/abs/1903.07592
We study second-harmonic generation (SHG) arising from surface nonlinearity at a metal-dielectric interface using a spectral decomposition method. Since our method avoids the need to consider the generalized boundary condition across the metal-dielec
Externí odkaz:
http://arxiv.org/abs/1705.08682
We study phase conjugation in a nonlinear composite slab when the counter propagating pump waves are completely absorbed by means of coherent perfect absorption. Under the undepleted pump approximation the coupling constant and the phase conjugated r
Externí odkaz:
http://arxiv.org/abs/1611.06841
Autor:
Reddy, K. Nireekshan, Gupta, S. Dutta
We review some of the recent concepts and their realization exploiting the perfect destructive interference of light in micro and nano structures. One refers to optical structures where the effective absorption can be controlled and maximized to perf
Externí odkaz:
http://arxiv.org/abs/1407.4276
Autor:
Reddy, K. Nireekshan, Gupta, S. Dutta
We study theoretically a PT-symmetric saturable balanced gain-loss system in a ring cavity configuration. The saturable gain and loss are modeled by two-level medium with or without population inversion. We show that the specifics of the spectral sin
Externí odkaz:
http://arxiv.org/abs/1405.6812
Publikováno v:
Published in the Proceedings of National Seminar on "Recent Advances in Physics", pp 18-26, 2014, NOU
Systems governed by the Non-linear Schroedinger Equation (NLSE) with various external PT-symmetric potentials are considered. Exact solutions have been obtained for the same through the method of ansatz, some of them being solitonic in nature. It is
Externí odkaz:
http://arxiv.org/abs/1402.5762
Autor:
Reddy, K. Nireekshan, Gupta, S. Dutta
We study excitation of gap solitons under the conditions of coherent perfect absorption (CPA). Our system consists of a symmetric periodic structure with alternating Kerr nonlinear and linear layers, illuminated from both the ends. We show near-total
Externí odkaz:
http://arxiv.org/abs/1402.4910
Autor:
Reddy, K. Nireekshan, Gupta, S. Dutta
We study coherent perfect absorption (CPA) of light in a Kerr nonlinear metal-dielectric composite medium, illuminated from the opposite ends. Elementary symmetry considerations reveal that equality of the incident light intensities is a prerequisite
Externí odkaz:
http://arxiv.org/abs/1306.3394