عنوان

Arsenic Trisulfide on Lithium Niobate for Acousto-Optic Interactions

Number

TL57780

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Arsenic Trisulfide on Lithium Niobate for Acousto-Optic Interactions

General Material Designation

[Thesis]

First Statement of Responsibility

Khan, Md Shofiqul Islam

Subsequent Statement of Responsibility

Piazza, Gianluca

Name of Publisher, Distributor, etc.

Carnegie Mellon University

Date of Publication, Distribution, etc.

2021

Text of Note

91 p.

Dissertation or thesis details and type of degree

Ph.D.

Body granting the degree

Carnegie Mellon University

Text preceding or following the note

2021

Text of Note

Effective optical processing of information in the integrated photonic circuits requires strong light confinement and guiding of light at the micronanoscale using waveguide structures, as well as techniques to control its propagation. Optical confinement is stronger for a guiding medium with a high refractive index and complex optical information processing is possible if this refractive index can be manipulated efficiently using multiple techniques. Refractive index manipulation is possible through various methods such as electro-optic, thermo-optic, magneto-optic and acousto-optic modulation. Acousto-optic modulation technique uses strain induced by the acoustic wave to change the refractive index of the optical wave propagation medium. Such modulators have successfully been demonstrated on material platforms such as aluminum nitride, gallium arsenide and lithium niobate. Despite having some of the highest electromechanical coupling coefficients and strong acousto-optic coefficients, these material platforms cannot simultaneously exploit the best material properties because of their anisotropy. In other words, if both acoustic devices and the photonic devices are built on one of these same material platforms, both devices may not be the most efficiently optimized because of the anisotropy of the material. We have studied lithium niobate as the piezoelectric substrate which is used to generate the acoustic wave and incorporated arsenic trisulfide, an isotropic material, as the photonic material platform which enables decoupling of the acoustic device from the photonic device. We have demonstrated arsenic trisulfide on oxide on lithium niobate as a material platform for low frequency (∼MHz) modulator application through an acousto-optic modulator formed by an arsenic trisulfide Mach-Zehnder interferometer, operating in a push-pull configuration and placed inside a surface acoustic wave cavity on a Y-cut lithium niobate wafer. A comprehensive analytical modeling of the acousto-optic interaction is offered which enabled the first ever extraction of acousto-optic coefficients for the thin film arsenic trisulfide from an integrated device. First ever extraction of the thermal coefficients for waveguides on arsenic trisulfide, lithium niobate on insulator and arsenic trisulfide on lithium niobate on insulator using optical racetrack resonators is also demonstrated. Arsenic trisulfide on lithium niobate on insulator is discussed as a high frequency (∼GHz) modulator platform which includes a qualitative study of this hybrid material platform. This hybrid material platform will pave new opportunities for microwave-to-optical conversion, non-reciprocal devices, Brillouin scattering and beam steering applications.

Subject Term

Acoustics

Subject Term

Engineering

Subject Term

Optics

Khan, Md Shofiqul Islam

Piazza, Gianluca

Carnegie Mellon University

Electronic name

p

[Thesis]

276903

a

Y