
Jatadhari Mishra
Ph.D. Student in Applied Physics, admitted Autumn 2016
All Publications
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Degenerate optical parametric amplification in CMOS silicon
OPTICA
2023; 10 (4): 430-437
View details for DOI 10.1364/OPTICA.478702
View details for Web of Science ID 000988200600001
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Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate
OPTICS EXPRESS
2022; 30 (18): 32752-32760
View details for DOI 10.1364/OE.467580
View details for Web of Science ID 000850229100099
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Ultra-low-power second-order nonlinear optics on a chip.
Nature communications
2022; 13 (1): 4532
Abstract
Second-order nonlinear optical processes convert light from one wavelength to another and generate quantum entanglement. Creating chip-scale devices to efficiently control these interactions greatly increases the reach of photonics. Existing silicon-based photonic circuits utilize the third-order optical nonlinearity, but an analogous integrated platform for second-order nonlinear optics remains an outstanding challenge. Here we demonstrate efficient frequency doubling and parametric oscillation with a threshold of tens of micro-watts in an integrated thin-film lithium niobate photonic circuit. We achieve degenerate and non-degenerate operation of the parametric oscillator at room temperature and tune its emission over one terahertz by varying the pump frequency by hundreds of megahertz. Finally, we observe cascaded second-order processes that result in parametric oscillation. These resonant second-order nonlinear circuits will form a crucial part of the emerging nonlinear and quantum photonics platforms.
View details for DOI 10.1038/s41467-022-31134-5
View details for PubMedID 35927246
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Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate
OPTICS LETTERS
2022; 47 (11): 2830-2833
Abstract
Existing nonlinear-optic implementations of pure, unfiltered heralded single-photon sources do not offer the scalability required for densely integrated quantum networks. Additionally, lithium niobate has hitherto been unsuitable for such use due to its material dispersion. We engineer the dispersion and the quasi-phasematching conditions of a waveguide in the rapidly emerging thin-film lithium niobate platform to generate spectrally separable photon pairs in the telecommunications band. Such photon pairs can be used as spectrally pure heralded single-photon sources in quantum networks. We estimate a heralded-state spectral purity of >94% based on joint spectral intensity measurements. Further, a joint spectral phase-sensitive measurement of the unheralded time-integrated second-order correlation function yields a heralded-state purity of (86±5)%.
View details for DOI 10.1364/OL.456873
View details for Web of Science ID 000807404900056
View details for PubMedID 35648941
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Dispersion-engineered chi((2)) nanophotonics: a flexible tool for nonclassical light
JOURNAL OF PHYSICS-PHOTONICS
2021; 3 (4)
View details for DOI 10.1088/2515-7647/ac1729
View details for Web of Science ID 000700772400001
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Mid-infrared nonlinear optics in thin-film lithium niobate on sapphire
OPTICA
2021; 8 (6): 921-924
View details for DOI 10.1364/OPTICA.427428
View details for Web of Science ID 000663363600024
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Fully-Resonant Second Harmonic Generation in Periodically Poled Thin-Film Lithium Niobate
IEEE. 2021
View details for Web of Science ID 000831479801219
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Optical Parametric Oscillator in Thin-Film Lithium Niobate with a 130 mu W Threshold
IEEE. 2021
View details for Web of Science ID 000831479803278
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Mid-infrared nonlinear optics in thin-film lithium niobate on sapphire
IEEE. 2021
View details for Web of Science ID 000831479802196