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Title:High quality integrated LiNbO3 acousto-optic platform for visible light spectrum
Author(s):Orsel, Ogulcan Emre
Advisor(s):Bahl, Gaurav
Department / Program:Mechanical Sci & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Integrated photonics, acousto-optics, electro-optics, nonlinear photonics
Abstract:The laser's invention, which produced a coherent light source, has accelerated the development of acousto-optic platforms (AlN, GaN, Quartz, LiNbO3) for many practical applications such as beam steering, signal processing, and intensity modulation. The recent integration of on-chip acousto-optic devices with photonic integrated circuits lead to many different acousto-optic devices such as efficient microwave converters, optical isolators, and wavelength scale acousto-optic frequency shifters, which were not realizable before. However, all of these devices target the 1550 nm optical wavelength or mid IR spectrum, and there is no integrated acousto-optic platform for visible wavelengths to the best of our knowledge. This thesis proposes that a LiNbO3 platform can produce a high acousto-optic coupling rate that can be used as a microwave to optical conversion. To have high coupling, we utilized LiNbO3's ultra-high electromechanical coupling for S0 lamb wave mode excitation. We employed LiNbO3's ultra-low optical loss as an interaction enhancement between light and sound for our resonator structures. Our results revealed that intra-band/inter-band optical scattering in LiNbO3 is strongly enhanced by its large piezoelectric, photoelastic, and electro-optic coefficients leading to efficient sideband generation.
Issue Date:2021-04-28
Rights Information:Copyright 2021 Ogulcan Emre Orsel
Date Available in IDEALS:2021-09-17
Date Deposited:2021-05

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