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Microscopic study of resonant third-harmonic generation from amorphous silicon nanodisk arrays

Deka, Jayanta and Jha, Keshav Kumar and Menon, Sruti and Krishna, AS Lal and Biswas, Rabindra and Raghunathan, Varun (2018) Microscopic study of resonant third-harmonic generation from amorphous silicon nanodisk arrays. In: OPTICS LETTERS, 43 (21). pp. 5242-5245.

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Official URL: http://dx.doi.org/10.1364/OL.43.005242


A detailed microscopic study of third-harmonic generation (THG) from two-dimensional arrays of sub-wavelength spaced amorphous silicon nanodisks is reported. The arrays are designed to support broadband, minimally angle-sensitive resonances for the fundamental excitation wavelength in the 1500 nm region. This results in resonantly enhanced visible THG in the green spectral range with similar to 500-fold enhancement on-resonance, compared to the un-patterned a-Si thin-film. THG multispectral microscopic imaging reveals individual nanodisks with enhanced non-linear signal on-resonance. For increasing pump intensities, spatially dependent saturation effects are observed for the first time, to the best of our knowledge, in such dielectric nanostructure arrays with THG images showing a reversal of contrast. (C) 2018 Optical Society of America

Item Type: Journal Article
Additional Information: Copy right for this article belong to OPTICAL SOC AMER
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 20 Nov 2018 17:27
Last Modified: 20 Nov 2018 17:27
URI: http://eprints.iisc.ac.in/id/eprint/61111

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