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:
IEEE Photonics Journal, Vol 13, Iss 1, Pp 1-1 (2021)
Corrections were made to references in the above named paper.
Externí odkaz:
https://doaj.org/article/cfb49e6269144341ad7927a4ab108a65
Publikováno v:
Micromachines, Vol 11, Iss 4, p 449 (2020)
Nonlinear optics is an important area of photonics research for realizing active optical functionalities such as light emission, frequency conversion, and ultrafast optical switching for applications in optical communication, material processing, pre
Externí odkaz:
https://doaj.org/article/51c01ac3e1f54979b6ff157b75d66f49