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Single-Crystalline Aluminum Nitride ...

Bruch, Alexander W.

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Single-Crystalline Aluminum Nitride for Visible Nonlinear Photonics.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Single-Crystalline Aluminum Nitride for Visible Nonlinear Photonics./
Author:	Bruch, Alexander W.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	249 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
Contained By:	Dissertations Abstracts International82-12B.
Subject:	Optics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27741577
ISBN:	9798516082443

Single-Crystalline Aluminum Nitride for Visible Nonlinear Photonics.
Bruch, Alexander W.

Single-Crystalline Aluminum Nitride for Visible Nonlinear Photonics. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 249 p.

Source: Dissertations Abstracts International, Volume: 82-12, Section: B.

Thesis (Ph.D.)--Yale University, 2020.

This item must not be sold to any third party vendors.

Quadratic optical nonlinearity is one of the most common methods of generating coherent light at both short and long wavelengths. With the advent of integrated photonics, there is a great need to shrink these optical frequency converters from a bulk crystal to a nanophotonic waveguide for portable and scalable applications. The commercial success of flat panel displays, Blu-ray lasers, and LED lighting has launched Al(Ga)N as the second most widely used semiconductor across the globe. Aluminum nitride (AlN) in particular is unique among common semiconductors as it possesses both quadratic and cubic nonlinearities as well as one of the largest band-gaps in use today; this combination enables optical frequency conversion from the ultraviolet to the mid-infrared in a chip-scale platform. Despite its widespread use in short wavelength LEDs and laser diodes, relatively little work has investigated single-crystalline AlN films for quadratic frequency conversion. In this thesis, I will outline my work in developing single-crystalline AlN as an exceptional platform for quadratic nonlinear photonics at visible wavelengths.Chapters 1 and 2 will begin the thesis with a review quadratic nonlinearity and nonlinear photonic design. Chapter 3 then highlights my preliminary work in Ga-rich (Al)GaN films for visible wavelength operation. I will demonstrate broadband waveguiding in epitaxial GaN films and investigate the effect of defects at the GaN/sapphire boundary. We then realize ultra-high optical quality factors in the visible regime using an electrochemically-sliced AlGaN nanomembrane device platform.In Chapter 4, I will introduce a new method of fabricating epitaxial AlN photonic devices yielding optical quality factors more than triple their polycrystalline counterparts. Systematic optimization of the microring and coupler geometries allows for efficient second-harmonic generation from the telecom infrared to the near-visible. This device demonstrates supremacy of the single-crystalline AlN platform by showcasing 17,000 %/W second-harmonic conversion efficiency, a seven-fold improvement to the previous state-of-the-art.Unlike second-harmonic generation, optical parametric oscillation has a challenging power threshold that significantly limits implementation of a micro-scale platform. Chapter 5 builds upon the high second-harmonic conversion efficiency to realize the first nanophotonic optical parametric oscillator. This AlN device exhibits a low parametric oscillation threshold of 12 mW and features a 17 % conversion efficiency and milliwatt-level output power. The high nonlinearity of this AlN microring system yields a 70x reduction in device footprint while maintaining comparable performance to previous bulk resonators.Subsequently, Chapter 6 will demonstrate how cascaded frequency up- and down-conversion may couple together to form a frequency comb purely from quadratic nonlinearity. The tight control of nonlinearity in the Pockels microcomb allows the first experimental demonstration of a quadratic soliton. Numerical simulations suggest the presence of multiple Turing pattern states that deterministically transition the quadratic microcomb from a multiple soliton to single soliton state. This novel comb system exhibits an unprecedentedly high 17 % pump-to-soliton conversion efficiency and deterministic soliton fidelity. Given the advancements in short wavelength light sources presented, Chapter 7 will conclude the thesis with a review of proof-of-concept spectroscopy employing nanophotonic AlN waveguides as a broadband, coherent light source. Results show that UV-Vis absorbance spectroscopy of fluorescence dyes yield a 100x improvement in detection limit using a broadband comb source versus a conventional thermal light source. This thesis poses epitaxial AlN as a serious contender to conventional quadratic materials such as lithium niobate for optical frequency conversion.

ISBN: 9798516082443Subjects--Topical Terms:

517925
Optics.
Subjects--Index Terms:

Aluminum nitride

Single-Crystalline Aluminum Nitride for Visible Nonlinear Photonics.
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100 1 $a Bruch, Alexander W. $3 3559114
245 1 0 $a Single-Crystalline Aluminum Nitride for Visible Nonlinear Photonics.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 249 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
500 $a Advisor: Tang, Hong X.
502 $a Thesis (Ph.D.)--Yale University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Quadratic optical nonlinearity is one of the most common methods of generating coherent light at both short and long wavelengths. With the advent of integrated photonics, there is a great need to shrink these optical frequency converters from a bulk crystal to a nanophotonic waveguide for portable and scalable applications. The commercial success of flat panel displays, Blu-ray lasers, and LED lighting has launched Al(Ga)N as the second most widely used semiconductor across the globe. Aluminum nitride (AlN) in particular is unique among common semiconductors as it possesses both quadratic and cubic nonlinearities as well as one of the largest band-gaps in use today; this combination enables optical frequency conversion from the ultraviolet to the mid-infrared in a chip-scale platform. Despite its widespread use in short wavelength LEDs and laser diodes, relatively little work has investigated single-crystalline AlN films for quadratic frequency conversion. In this thesis, I will outline my work in developing single-crystalline AlN as an exceptional platform for quadratic nonlinear photonics at visible wavelengths.Chapters 1 and 2 will begin the thesis with a review quadratic nonlinearity and nonlinear photonic design. Chapter 3 then highlights my preliminary work in Ga-rich (Al)GaN films for visible wavelength operation. I will demonstrate broadband waveguiding in epitaxial GaN films and investigate the effect of defects at the GaN/sapphire boundary. We then realize ultra-high optical quality factors in the visible regime using an electrochemically-sliced AlGaN nanomembrane device platform.In Chapter 4, I will introduce a new method of fabricating epitaxial AlN photonic devices yielding optical quality factors more than triple their polycrystalline counterparts. Systematic optimization of the microring and coupler geometries allows for efficient second-harmonic generation from the telecom infrared to the near-visible. This device demonstrates supremacy of the single-crystalline AlN platform by showcasing 17,000 %/W second-harmonic conversion efficiency, a seven-fold improvement to the previous state-of-the-art.Unlike second-harmonic generation, optical parametric oscillation has a challenging power threshold that significantly limits implementation of a micro-scale platform. Chapter 5 builds upon the high second-harmonic conversion efficiency to realize the first nanophotonic optical parametric oscillator. This AlN device exhibits a low parametric oscillation threshold of 12 mW and features a 17 % conversion efficiency and milliwatt-level output power. The high nonlinearity of this AlN microring system yields a 70x reduction in device footprint while maintaining comparable performance to previous bulk resonators.Subsequently, Chapter 6 will demonstrate how cascaded frequency up- and down-conversion may couple together to form a frequency comb purely from quadratic nonlinearity. The tight control of nonlinearity in the Pockels microcomb allows the first experimental demonstration of a quadratic soliton. Numerical simulations suggest the presence of multiple Turing pattern states that deterministically transition the quadratic microcomb from a multiple soliton to single soliton state. This novel comb system exhibits an unprecedentedly high 17 % pump-to-soliton conversion efficiency and deterministic soliton fidelity. Given the advancements in short wavelength light sources presented, Chapter 7 will conclude the thesis with a review of proof-of-concept spectroscopy employing nanophotonic AlN waveguides as a broadband, coherent light source. Results show that UV-Vis absorbance spectroscopy of fluorescence dyes yield a 100x improvement in detection limit using a broadband comb source versus a conventional thermal light source. This thesis poses epitaxial AlN as a serious contender to conventional quadratic materials such as lithium niobate for optical frequency conversion.
590 $a School code: 0265.
650 4 $a Optics. $3 517925
650 4 $a Molecular physics. $3 3174737
650 4 $a Physics. $3 516296
653 $a Aluminum nitride
653 $a Nonlinear optics
653 $a Optical parametric oscillation
653 $a Photonics
653 $a Second harmonic generation
690 $a 0752
690 $a 0605
690 $a 0609
710 2 $a Yale University. $b Electrical Engineering. $3 2093152
773 0 $t Dissertations Abstracts International $g 82-12B.
790 $a 0265
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27741577