Nanocavity enhanced light-matter interaction within ultra-thin films

A fundamental strategy is developed in this dissertation to enhance the light-matter interaction of ultra-thin films based on a strong interference effect in planar nano-cavities, and overcome the limitation between the optical absorption and film thickness of energy harvesting/conversion materials. This principle is quite general and is particularly useful for the development of atomically-thin energy harvesting/conversion devices. This dissertation systematically investigated the enhancement introduced by nanocavities, including the theoretical design of the nano-cavities, experimental validation of the enhanced light-matter interactions, and application development based on this strategy. In Chapter 2, the nano-cavities are theoretically designed for different ultra-thin material systems. Phasor diagrams and the concept of topological darkness are introduced to better understand the design. In Chapter 3, the enhanced light-matter interaction is validated experimentally. Stronger absorption is achieved and confirmed by the stronger photoluminescence signal. In Chapter 4, an optoelectronic application of single-crystalline germanium nanomembrane photodetectors on foreign nano-cavities was developed with field effect and spectral selectivity. This dissertation aims to analyze the both the strength and the limit of this strategy based on nano-cavities and paves the way towards miniaturization of optoelectronic devices.

Grantor dc:publisher

State University of New York at Buffalo

Year dc:date.issued

2018

Author dc:creator

• Song, Haomin

Contributors dc:contributor

• Gan, Qiaoqiang
• Electrical Engineering

• electrical engineering

Statement dc:rights

• Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.
• Copyright retained by author.

Language dc:language

eng

Handle dc:identifier

http://hdl.handle.net/10477/78061

OAI record oai:identifier

https://ubir.buffalo.edu/oai/request?verb=GetRecord&metadataPrefix=qdc&identifier=oai%3Aubir.buffalo.edu%3A10477%2F78061