Dr. Naresh K. Emani Profile

Dr. Naresh K. Emani

Associate Professor at Indian Institute of Technology Hyderabad

SPIE Involvement:

Author | Student Chapter Advisor

Publications (5)

Proceedings Article | 24 May 2022 Presentation + Paper

Tunable directional emission from electrically-driven nanostrip tunnel junctions

Saurabh Kishen, Jinal Tapar, Naresh Kumar Emani

Proceedings Volume 12130, 1213007 (2022) https://doi.org/10.1117/12.2622183

KEYWORDS: Passive elements, Plasmons, Silver, Scattering, Switching, Light sources, Nano antennas, Nano light sources, Beam steering, Strongly localized plasmons, Dynamic light scattering

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Proceedings Article | 17 May 2022 Presentation + Paper

Modelling of a tunable and room temperature operable mid-infrared photodetector using graphene nanoribbons

Vinod Sharma, Jinal Tapar, Saurabh Kishen, Naresh Emani

Proceedings Volume 12139, 121390H (2022) https://doi.org/10.1117/12.2622429

KEYWORDS: Graphene, Photodetectors, Plasmonics, Absorption, Mid-IR, Plasmons, Field effect transistors, Modeling, Solar energy, Phonons

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Proceedings Article | 1 August 2021 Presentation + Paper

Dynamically tunable asymmetric transmission in PT-symmetric metasurfaces

Jinal Tapar, Saurabh Kishen, Naresh Kumar Emani

Proceedings Volume 11796, 1179617 (2021) https://doi.org/10.1117/12.2593585

KEYWORDS: Diffraction, Modulation, Indium gallium phosphide, Scattering, Refractive index, Near field optics, Resonators, Radiation effects, Physics

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Proceedings Article | 29 September 2017 Presentation

New material platforms for dielectric nanoantennas and metasurfaces (Conference Presentation)

Naresh Emani, Hanfang Hao, Egor Khaidarov, Ramon Paniagua-Dominguez, Yuan Hsing Fu, Reuben Bakker, Vytautas Valuckas, Arseniy Kuznetsov

Proceedings Volume 10346, 103460S (2017) https://doi.org/10.1117/12.2273861

KEYWORDS: Dielectrics, Group III-V semiconductors, Nanostructures, Plasmonics, Visible radiation, Semiconductors, Titanium, Silicon, Gallium arsenide, Gallium nitride

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Optically resonant dielectric nanostructures is a new direction in nanophotonic research which gives a strong promise to compliment or substitute plasmonics in many potential application areas [1]. The main advantages of resonant dielectric nanostructures over conventional plasmonics are low losses, wide range of applicable dielectric materials and strong magnetic resonant response. So far most of research in this field has been conducted with silicon as a material for nanostructures due to its one of the highest value of refractive index at optical frequencies and CMOS compatibility. However, while silicon is an excellent material of choice for operation in the near-IR spectral range its applicability for visible frequencies is limited by increasing losses inside the material. Also, being an indirect bandgap semiconductor it is not a suitable material for making active nanoantenna devices. For these reasons in recent studies research focus starts shifting towards other appropriate materials such as III-V semiconductors, e.g. GaAs or GaP, and wide-bandgap semiconductors such as TiO2. In this presentation we will discuss applicability of different dielectric/semiconductor material platforms for obtaining resonant nanoantennas and metasurfaces operating in the visible frequency range. We will first show that titanium dioxide metasurfaces can be designed to obtain sharp resonances and full phase control at all three RGB wavelengths through Huygens’ metasurface approach, which pave the way towards realization of thin multi-layer metasurfaces with multi-colour operation. Then we will introduce a new III-V material platform based on GaN, which is highly transparent through the whole visible spectrum, and show high-efficiency operation of GaN metasurfaces in the blue and green parts of the visible spectrum. Finally we will discuss active nanoantennas based on GaAs and show the path towards achieving laser emission from resonant semiconductor nanoantenna structures. References: 1) A. I. Kuznetsov et al., “Optically resonant dielectric nanostructures”, Science 354, aag2472 (2016).

Proceedings Article | 1 October 2015 Presentation

In-the-cloud optimization tool for retrieving experimentally fitted conductivity of graphene (Presentation Recording)

Ludmila Prokopeva, You-Chia Chang, Naresh Emani, Ted Norris, Alexander Kildishev

Proceedings Volume 9546, 95461W (2015) https://doi.org/10.1117/12.2190139

KEYWORDS: Graphene, Nanophotonics, Optical properties, Optical components, Active remote sensing, Eye, Eye models, Instrument modeling, Nanostructuring, Oscillators

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