Efficient Poling-Free Wavelength Conversion in Thin Film Lithium Niobate Harnessing Bound States in the Continuum

Chakkoria, JJ and Aoni, RA and Dubey, A and Ren, G and Nguyen, TG and Boes, A and Selvaraja, SK and Mitchell, A (2024) Efficient Poling-Free Wavelength Conversion in Thin Film Lithium Niobate Harnessing Bound States in the Continuum. In: Laser and Photonics Reviews, 18 (11).

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Abstract

Over the past two decades, there has been a surge of interest in photonic integrated circuits (PICs) to enable low-cost industrial mass manufacture of miniaturized optical systems while simultaneously improving performance and energy efficiency following the trajectory of electronics and large-scale integration. An essential characteristic of any PIC lies in the ability of waveguides to efficiently confine light. The phenomenon of bound states in the continuum (BIC) shows promise in achieving confinement of light for modes that otherwise would suffer from high leakage losses, which can occur in many PIC platforms. In this contribution, the usefulness of operating near a BIC to achieve efficient second harmonic generation of �300 W�1 cm�2 in Silicon Nitride (SiN) loaded lithium niobate on insulator (LNOI) waveguides without needing to either pole or etch the lithium niobate is experimentally demonstrated. The guided fundamental mode is phase matched at the telecom wavelength to a higher order mode at the second harmonic wavelength that is engineered as a bound state in the continuum to mitigate leakage losses. This demonstrates the promise of using BIC in weakly confining waveguides for nonlinear optical applications all while avoiding the poling process by engineering waveguide geometry. © 2024 The Author(s). Laser & Photonics Reviews published by Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Laser and Photonics Reviews
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to authors.
Keywords:	Conversion efficiency; Costs; Electric losses; Energy efficiency; Harmonic analysis; Lithium; Niobium compounds; Nonlinear optics; Phase matching; Photonic devices; Photonic integration technology; Silicon nitride; Silicon photonics; Waveguides, Bound state in the continuum; Bound-states; Improving performance; Integrated photonics; Leakage loss; Lithium niobate; Low-costs; Modal phase matching; Photonics Integrated Circuits; Thin-films, Harmonic generation
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	19 Dec 2024 09:15
Last Modified:	19 Dec 2024 09:15
URI:	http://eprints.iisc.ac.in/id/eprint/85901

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