Voltage-Controlled Negative Index in Vertically Coupled Quantum Dot Systems

TL;DR

This paper demonstrates voltage-controlled negative refractive index in quantum dot systems, allowing continuous tuning from -7 to 7 with minimal absorption, enabling different negative index regimes at various voltages.

Contribution

It introduces a method to achieve and control negative refractive index in quantum dot systems via bias voltage, a novel approach in nanophotonics.

Findings

Refractive index can be tuned from -7 to 7 by voltage.

Low absorption during index tuning.

Single-negative and double-negative index regimes are achievable.

Abstract

We demonstrate that voltage-controlled negative index can be obtained in self-organized InAs quantum dot systems. As the bias voltage changes, the refractive index can be adjusted and controlled continuously from -7 to 7. Simultaneously, the absorption of light in the system will be very small. The single-negative index materials and the double-negative index materials can be achieved in different bias voltages.