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

doi:10.1117/12.2609737

5 March 2022 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

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Proceedings Volume 12003, 2D Photonic Materials and Devices V; 1200307 (2022) https://doi.org/10.1117/12.2609737
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

We report Second Harmonic Generation (SHG) enhancement in a custom-designed vertically stacked multilayer Gallium Selenide with a low-index PMMA spacer layer. The structure obtained using an evolutionary optimization algorithm consists of two 40 nm GaSe layers separated by a 195 nm PMMA layer, with a 130 nm Silicon-dioxide layer on a Silicon substrate. This results in 11x and 303x enhancement in SHG signal when compared to a single 40nm GaSe on a 130nm and 300nm SiO₂/Si substrate, respectively. This work underscores the importance of micro-cavity engineering in choosing appropriate 2D material and interspacer thickness to enhance SHG emission from popular 2D materials.

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Rabindra Biswas, Asish Prosad, Lal Krishna A.S., Sruti Menon, and Varun Raghunathan "Enhanced second harmonic generation from vertically stacked multilayer gallium selenide separated by low-index PMMA spacer layer", Proc. SPIE 12003, 2D Photonic Materials and Devices V, 1200307 (5 March 2022); https://doi.org/10.1117/12.2609737

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