Nanobeam photonic crystal cavity quantum dot laser

TL;DR

This paper investigates room-temperature lasing in GaAs nanobeam photonic crystal cavities with embedded InAs quantum dots, demonstrating low-threshold operation and wavelength tunability using a fiber taper for pumping and emission collection.

Contribution

It presents the first demonstration of low-threshold, tunable nanobeam cavity lasers with embedded quantum dots at room temperature.

Findings

Lasing observed across the quantum dot PL spectrum.

Thresholds as low as 0.3 μW at 780 nm pump.

Wavelength tuning of up to 7 nm using a fiber taper.

Abstract

The lasing behavior of one dimensional GaAs nanobeam cavities with embedded InAs quantum dots is studied at room temperature. Lasing is observed throughout the quantum dot PL spectrum, and the wavelength dependence of the threshold is calculated. We study the cavity lasers under both 780 nm and 980 nm pump, finding thresholds as low as 0.3 uW and 19 uW for the two pump wavelengths, respectively. Finally, the nanobeam cavity laser wavelengths are tuned by up to 7 nm by employing a fiber taper in near proximity to the cavities. The fiber taper is used both to efficiently pump the cavity and collect the cavity emission.