Bidirectional wavelength tuning of semiconductor quantum dots as artificial atoms in an optical resonator

TL;DR

This paper demonstrates a method to tune semiconductor quantum dots into resonance with each other and with optical resonator modes by mechanically deforming a ring structure, enabling dynamic control of their optical properties.

Contribution

It introduces a novel approach for bidirectional wavelength tuning of quantum dots using elastic deformation of a ring resonator, combining theoretical predictions with experimental validation.

Findings

Quantum dots can be elastically tuned into resonance.

Resonance tuning achieved by external mechanical deformation.

Experimental verification with rolled-up micro tube resonator.

Abstract

We consider a pair of artificial atoms with different ground state energies. By means of finite element calculations we predict that the ground state energies can be tuned into resonance if the artificial atoms are placed into a flexible ring structure, which is elastically deformed by an external force. This concept is experimentally verified by embedding a low density of self-assembled quantum dots into the wall of a rolled up micro tube ring resonator. We demonstrate that quantum dots can elastically be tuned in- and out of resonance with each other or with the ring resonator modes.