Rolled-up InGaAs/GaAs tubes for strain engineering of light emitter and cavity interaction in whispering gallery mode resonators

• Grant number: 23/05972-2
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: August 01, 2023
• End date: May 31, 2026
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: José Roberto de França Arruda
• Grantee: Carolyne Beatriz Simões Valentin
• Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 18/15894-0 - Periodic structure design and optimization for enhanced vibroacoustic performance: ENVIBRO, AP.TEM

Abstract

Over the past two decades, rolled-up semiconductor membranes have been recognized as effective whispering gallery mode resonators. Their formation is predicated upon the selective removal of a sacrificial layer, resulting in the release of an inherently strained heterostructure. Upon release, the relaxation of strain induces the bending of the liberated film, subsequentlyforming a tube through a self-assembly process. These resonators are capable of achieving quality factors of 3000 or higher, facilitating the seamless incorporation of additional materialsinto the fabrication process. The concept of hybrid rolled-up structures has indeed gainedprominence over the last twenty years, with demonstrations across various III-As semiconductorheterostructures with diverse material systems, including oxides, organic molecules, and metals.In this project, we want to integrate the various 2D materials like CrSBr or InSe into a rolled-up III-As heterostructure - an inherently strained epitaxial layer of InAlGaAs/GaAs. Therefore, we will investigate the exfoliation behavior of the 2D material and its interaction with a GaAs surface. We aim to determine whether the contact with the semiconductor substrate causes any carrier depletion or quenching of photoluminescence of the material. In the next step, we will transfer flakes of the material to a prepared III-As heterostructure and fabricate rolled-up tubes. Finally, we will conduct an optical characterization on the obtained tubes. The experimental work will be supported by finite-difference time domain (FDTD) simulations as wellas strain calculations and band structure calculations to predict and understand the observed optical properties. It is worth pointing out that CrBrS is a ferro- or antiferromagnetic material (depending on the number of layers), and therefore, the magnetoluminescence of this material in a curved geometry is of great interest. (AU)