Electrostatically tunable optomechanical "zipper" cavity laser

TL;DR

This paper demonstrates a nanoscale optomechanical laser cavity whose wavelength can be electrically tuned and modulated at high speeds, using electrostatic actuation on a photonic crystal nanobeam structure.

Contribution

It introduces a tunable zipper cavity laser with electrostatic control, enabling wavelength tuning and high-frequency modulation at room temperature.

Findings

Electrostatic tuning rate of 0.25nm/V^2.

Lasing observed at 1.3 microns in InAsP/GaInAsP quantum wells.

Modulation frequency up to 6.7MHz.

Abstract

A tunable nanoscale "zipper" laser cavity, formed from two doubly clamped photonic crystal nanobeams, is demonstrated. Pulsed, room temperature, optically pumped lasing action at a wavelength of 1.3 micron is observed for cavities formed in a thin membrane containing InAsP/GaInAsP quantum-wells. Metal electrodes are deposited on the ends of the nanobeams to allow for micro-electro-mechanical actuation. Electrostatic tuning and modulation of the laser wavelength is demonstrated at a rate of 0.25nm/V^2 and a frequency as high as 6.7MHz, respectively.