Dr. Rabindra Biswas Profile

Dr. Rabindra Biswas

at Indian Institute of Science Bengaluru

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Publications (11)

Proceedings Article | 8 March 2024 Presentation + Paper

Enhanced sum frequency generation using vertically stacked Mie resonators

Rabindra Biswas, Felix Vennberg, Ajith Padyana Ravishankar, Srinivasan Anand, Varun Raghunathan

Proceedings Volume 12884, 128840D (2024) https://doi.org/10.1117/12.3002407

KEYWORDS: Sum frequency generation, Resonators, Emission wavelengths, Gallium arsenide, Optical resonators, Electric fields, Signal detection, Nonlinear optics, Near field optics, Microresonators

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Proceedings Article | 17 March 2023 Presentation + Paper

Chiral harmonic generation studies from partially etched amorphous silicon nanodisk arrays

Jayanta Kumar Deka, Jyothsna K.M., Rabindra Biswas, Varun Raghunathan

Proceedings Volume 12423, 124230A (2023) https://doi.org/10.1117/12.2650517

KEYWORDS: Second harmonic generation, Polarization, Amorphous silicon, Signal detection, Harmonic generation, Nonlinear optics, Silicon, Scanning electron microscopy, Polarized light

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Proceedings Article | 17 March 2023 Presentation + Paper

Enhanced four wave mixing from MoS2 disks supporting higher-order anapole resonance

Rabindra Biswas, Asish Prosad, Lal Krishna, Varun Raghunathan

Proceedings Volume 12423, 1242308 (2023) https://doi.org/10.1117/12.2650009

KEYWORDS: Molybdenum, Resonators, Resonance enhancement, Four wave mixing, Electric fields, Scattering, Optical resonators, Simulations, Second harmonic generation

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Proceedings Article | 5 March 2022 Presentation + Paper

Enhanced third harmonic generation in layered guided mode resonant structures using pupil engineered conical excitation

Sruti Menon, Jyothsna K. M., Rabindra Biswas, Asish Prosad, A.S. Lal Krishna, Varun Raghunathan

Proceedings Volume 12011, 1201105 (2022) https://doi.org/10.1117/12.2609869

KEYWORDS: Amorphous silicon, Silicon, Harmonic generation, Optical simulations, Gaussian beams, Resonance enhancement

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Proceedings Article | 5 March 2022 Presentation + Paper

Quasi-BIC resonances in amorphous germanium zero contrast gratings with dual asymmetric step profile for mid infrared frequency up-conversion

Lal Krishna A.S., Jyothsna K. M., Asish Prosad, Rabindra Biswas, Sruti Menon, Varun Raghunathan

Proceedings Volume 12011, 1201104 (2022) https://doi.org/10.1117/12.2609838

KEYWORDS: Mid-IR, Etching, Germanium, FT-IR spectroscopy, Photons, Visible radiation, Signal processing, Objectives, Sum-frequency generation, Reflectivity

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Proceedings Article | 5 March 2022 Presentation + Paper

Enhanced second harmonic generation from vertically stacked multilayer gallium selenide separated by low-index PMMA spacer layer

Rabindra Biswas, Asish Prosad, Lal Krishna A.S., Sruti Menon, Varun Raghunathan

Proceedings Volume 12003, 1200307 (2022) https://doi.org/10.1117/12.2609737

KEYWORDS: Second-harmonic generation, Gases, Polymethylmethacrylate, Image enhancement, Harmonic generation, Gallium, Silicon, Optimization (mathematics), Nonlinear optics, Wave propagation

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Proceedings Article | 5 March 2021 Presentation + Paper

Harmonic generation from 2D materials coupled to resonant metasurfaces

Varun Raghunathan, Jayanta Deka, Lal Krishna, Sruti Menon, Jyothsna K.M., Rabindra Biswas

Proceedings Volume 11688, 116880K (2021) https://doi.org/10.1117/12.2578039

KEYWORDS: Harmonic generation, Dielectric polarization, Second-harmonic generation, Silicon, Diffraction, Nonlinear optics, Gallium, Dielectrics, Chemical vapor deposition

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Proceedings Article | 1 April 2020 Presentation + Paper

Silicon nitride based guided mode resonance structures for enhancement of nonlinear optical effects

Sruti Menon, Asish Prosad, Rabindra Biswas, Varun Raghunathan

Proceedings Volume 11345, 113451J (2020) https://doi.org/10.1117/12.2554525

KEYWORDS: Silicon, Amorphous silicon, Coating, Resonance enhancement, Silica, Etching, Optical design, Dielectrics, Polarization, Nanostructures

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Proceedings Article | 2 March 2020 Paper

Lens design-based optimization of path loss in a high data-rate indoor visible light communication link

Faheem Ahmad, Sathisha Ramachandrapura Nagaraju, Jyothsna K. M., Rabindra Biswas, Varun Raghunathan

Proceedings Volume 11272, 1127218 (2020) https://doi.org/10.1117/12.2545939

KEYWORDS: Transmitters, Receivers, Telecommunications, Semiconductor lasers, Lens design, Visible radiation, Modulation, Light emitting diodes, Optical communications, Sensors

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In this paper, lens design-based optimization of the optical system for a blue laser diode downconverted with remote phosphor based indoor visible light communication link is studied using optical raytracing and experimentally characterized for illumination/ communication performance. Data modulated 450nm blue laser-diode is used to excite a remote-phosphor to down-convert the blue spectrum to white which is transmitted over a direct line-of-sight free-space link and detected using an amplified p-i-n detector. The combination of transmit and receive lenses are optimized in Zemax ray-tracing software with the objective of minimizing the path loss or maximizing the light collection efficiency within the detector area when placed at different transmitter-to-receiver separation distance. It is found that contrary to the typical 1/d² dependence typically used in VLC system models, the path loss can be minimized at the required link distance by choosing the lens to phosphor and p-i-n detector distance at the transmitter and receiver side respectively. At the optimized location, the VLC link is experimentally characterized by transmitting digital data at a maximum rate of 700 Mbps and bit error rates (BER) obtained is much below 10^-3 . BER versus distance is also found to follow the inverse relation of the path-loss versus distance indicating that the optimized lens positions help in achieving improved data through-put due to minimization of the path losses. Optical spectra and color content measurements indicate that the optimized lens positioning results in enhanced blue content at the receive side due to efficient collection of the data modulated blue components at the expense of the green and red components of the down-converted white light. Further improvements to this link can be achieved by simultaneously optimizing performance at multiple wavelengths spanning blue, green and red wavelengths or using lower color temperature phosphors to improve illumination performance, albeit at the expense of some deterioration to the communication performance.

Proceedings Article | 18 February 2020 Presentation + Paper

Layer-dependent third-harmonic generation in multi-layer SnSe2

Rabindra Biswas, Medha Dandu, Keshav Kumar Jha, Sruti Menon, Jyothsna K. M., Kaushik Majumdar, Varun Raghunathan

Proceedings Volume 11282, 112820R (2020) https://doi.org/10.1117/12.2544799

KEYWORDS: Microscopy, Harmonic generation, Second-harmonic generation, Signal detection, Atomic force microscopy, Third-harmonic generation, Tin, Absorption, Nonlinear optics, Optical microscopy

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Proceedings Article | 22 July 2019 Paper

A spatiotemporal analysis using second harmonic generation reveals enhancement of type I collagen polymerization by dermatan sulfate glycosaminoglycans

Keshav Kumar Jha, Purba Sarkar, Rabindra Biswas, Ramray Bhat, Varun Raghunathan

Proceedings Volume 11076, 110761G (2019) https://doi.org/10.1117/12.2526896

KEYWORDS: Collagen, Polymerization, Second-harmonic generation, Harmonic generation, Microscopy, Image enhancement, Image filtering, Proteins, Polymers, Cancer

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Showing 5 of 11 publications

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