Zobrazeno 1 - 10
of 138
pro vyhledávání: '"Varun, Raghunathan"'
Publikováno v:
IEEE Photonics Journal, Vol 16, Iss 2, Pp 1-10 (2024)
Quantum random number generators (QRNG) based on amplified spontaneous emission (ASE) are known to achieve multi-gigabit-per-second rates through high-speed sampling of intensity and phase fluctuations. Two popular implementations of these QRNGs are
Externí odkaz:
https://doaj.org/article/2f99ad8c15e84376a56c5a8f1341bd1d
Autor:
Gwanjin Lee, Konkada Manattayil Jyothsna, Jonghoo Park, JaeDong Lee, Varun Raghunathan, Hyunmin Kim
Publikováno v:
PhotoniX, Vol 4, Iss 1, Pp 1-16 (2023)
Abstract Optical microscopy with optimal axial resolution is critical for precise visualization of two-dimensional flat-top structures. Here, we present sub-diffraction-limited ultrafast imaging of hexagonal boron nitride (hBN) nanosheets using a con
Externí odkaz:
https://doaj.org/article/ec6d11051ef2489194934fb9d3fa56a5
Autor:
Suman Chatterjee, Medha Dandu, Pushkar Dasika, Rabindra Biswas, Sarthak Das, Kenji Watanabe, Takashi Taniguchi, Varun Raghunathan, Kausik Majumdar
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-8 (2023)
Abstract Excitonic states trapped in harmonic moiré wells of twisted heterobilayers is an intriguing testbed for exploring many-body physics. However, the moiré potential is primarily governed by the twist angle, and its dynamic tuning remains a ch
Externí odkaz:
https://doaj.org/article/31915bf33f354051a850861329de6368
Publikováno v:
APL Photonics, Vol 8, Iss 8, Pp 086109-086109-11 (2023)
In this work, we report single- and two-photon absorption (TPA) induced transmission and resonance modulation in a multilayer gallium selenide (GaSe) integrated silicon nitride (Si3N4) waveguide and ring resonator operating in the 700–800 nm wavele
Externí odkaz:
https://doaj.org/article/ce2f0ca48c6944a3a701c4c43c5ffe22
Autor:
Rabindra Biswas, Medha Dandu, Asish Prosad, Sarthak Das, Sruti Menon, Jayanta Deka, Kausik Majumdar, Varun Raghunathan
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
Abstract We report strong second-harmonic generation (SHG) from 2H polytype of multilayer Tin diselenide (SnSe2) for fundamental excitation close to the indirect band-edge in the absence of excitonic resonances. Comparison of SHG and Raman spectra fr
Externí odkaz:
https://doaj.org/article/75e7cd6c58814a85a9cebf9cb2bfe7c0
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
Abstract Piezoelectric response in two-dimensional (2D) materials has evoked immense interest in using them for various applications involving electromechanical coupling. In most of the 2D materials, piezoelectricity is coupled along the in-plane dir
Externí odkaz:
https://doaj.org/article/8304f865d8634d97943ecd308181dc64
Publikováno v:
IEEE Photonics Journal, Vol 12, Iss 4, Pp 1-12 (2020)
We discuss an optical ray-tracing approach to minimizing path-loss in a variable link length indoor blue laser down-converted white light visible light communication (VLC) system. For a given link length, minimum path-loss is achieved by finding opti
Externí odkaz:
https://doaj.org/article/4856ccb0ace845aaafdce76cd9d2f231
Publikováno v:
IEEE Photonics Journal, Vol 11, Iss 4, Pp 1-11 (2019)
We present the design, fabrication, and experimental characterization of silicon nitride based medium-index contrast gratings on glass substrate for fluorescence enhancement in the yellow to red spectral range with resonances for both incident excita
Externí odkaz:
https://doaj.org/article/2f8a2cd4ffdb4e519e102c81b96bee95
Publikováno v:
Nanophotonics. 12:29-42
The integration of two-dimensional (2D) materials with resonant photonic structures is seen as a promising direction for enhancing its nonlinear optical response. The design of such heterogeneous resonant structures has often relied on multi-paramete
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e02990d92c802099713a903901e3f52e
https://doi.org/10.1515/nanoph-2022-0459
https://doi.org/10.1515/nanoph-2022-0459
Autor:
Ramesh Rajarapu, Prahalad Kanti Barman, Renu Yadav, Rabindra Biswas, Manikandan Devaraj, Saroj Poudyal, Bubunu Biswal, Vijay Laxmi, Gopal K. Pradhan, Varun Raghunathan, Pramoda K. Nayak, Abhishek Misra
Publikováno v:
ACS Nano. 16:21366-21376
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6af514f9e4606f21370fb415897992c6
https://doi.org/10.1021/acsnano.2c09673
https://doi.org/10.1021/acsnano.2c09673