Zobrazeno 1 - 10
of 129
pro vyhledávání: '"Gopal, Achanta Venu"'
Interlayer excitons in two dimensional semiconductor heterostructures show suppressed electron-hole overlap resulting in longer radiative lifetimes as compared to intralyer excitons. Such tightly bound interlayer excitons are relevant for important o
Externí odkaz:
http://arxiv.org/abs/2203.03586
Titanium dioxide is one of the most widely used wide bandgap materials. However, the TiO2 deposited on a substrate is not always transparent leading to a loss in efficiency of the device, especially, the photo response. Herein, we show that atomic la
Externí odkaz:
http://arxiv.org/abs/1807.11748
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:
Sangala, Bagvanth Reddy, Nagarajan, Arvind, Deshmukh, Prathmesh, Surdi, Harshad, Rana, Goutam, Gopal, Achanta Venu, Prabhu, S. S.
Publikováno v:
Pramana - J Phys 94, 2 (2020)
We report single and multiband linear polarizers for terahertz (THz) frequencies using cut-wire metamaterials (MM). The MMs are designed by finite element method, fabricated by electron beam lithography, and characterized by THz time-domain spectrosc
Externí odkaz:
http://arxiv.org/abs/1502.03657
We demonstrate a THz metamaterial with broadband dipole resonance originating due to the hybridization of LC resonances. The structure optimized by finite element method simulations is fabricated by electron beam lithography and characterized by tera
Externí odkaz:
http://arxiv.org/abs/1411.6464
Autor:
Kasture, Sachin, R, Ajith P, Yallapragada, V J, Patil, Raj, V., Nikesh V., Mulay, Gajendra, Gopal, Achanta Venu
Quasi-crystals are intriguing as they exhibit rotational symmetry and long range ordering but lack translational symmetry. 2-dimensional metal-dielectric patterns are interesting to make use of surface plasmon polariton (SPP) mediated local field enh
Externí odkaz:
http://arxiv.org/abs/1309.3286
Reflectionless potentials (RPs) represent a class of potentials that offer total transmission in the context of one dimensional scattering. Optical realization of RPs in stratified medium can exhibit broadband omnidirectional antireflection property.
Externí odkaz:
http://arxiv.org/abs/1309.0465
We study a critically coupled system (Opt. Lett., \textbf{32}, 1483 (2007)) with a Kerr-nonlinear spacer layer. Nonlinearity is shown to inhibit null-scattering in a critically coupled system at low powers. However, a system detuned from critical cou
Externí odkaz:
http://arxiv.org/abs/1305.5983
Autor:
Dutta-Gupta, Shourya, Deshmukh, Rahul, Gopal, Achanta Venu, Martin, Olivier J. F., Gupta, S. Dutta
We demonstrate bending of light on the same side of the normal in a free standing corrugated metal film under bi-directional illumination. Coherent perfect absorption (CPA) is exploited to suppress the specular zeroth order leading to effective back-
Externí odkaz:
http://arxiv.org/abs/1207.5324
Autor:
Brüggemann, Christian, Akimov, Andrey V., Glavin, Boris A., Belotelov, Vladimir I., Akimov, Ilya A., Jäger, Jasmin, Kasture, Sachin, Gopal, Achanta Venu, Vengurlekar, Arvind S., Yakovlev, Dmitri R., Kent, Anthony J., Bayer, Manfred
Coherent sub-THz phonons incident on a gold grating that is deposited on a dielectric substrate undergo diffraction and thereby induce an alteration of the surface plasmon-polariton resonance. This results in efficient high-frequency modulation (up t
Externí odkaz:
http://arxiv.org/abs/1206.2771