Time-resolved lasing action from single and coupled photonic crystal nanocavity array lasers emitting in the telecom band

Abstract

We measure the lasing dynamics of single and coupled photonic crystal nanocavity array lasers fabricated in the indium gallium arsenide phosphide material system. Under short optical excitation, single cavity lasers produce pulses as fast as 11 ps (FWHM), while coupled cavity lasers show significantly longer lasing duration which is not explained by a simple rate equations model. A Finite Difference Time Domain simulation including carrier gain and diffusion suggests that asynchronous lasing across the nanocavity array extends the laser's pulse duration.

Theory of nanolaser devices: Rate equation analysis versus microscopic theory

“…9 Therefore, the laser dynamics of nanocavity-based laser devices has been a much debated topic in recent years (see, e.g., Refs. [10][11][12][13][14][15][16].…”

Static and Dynamic Analysis of Lasing Action from Single and Coupled Photonic Crystal Nanocavity Lasers

“…Moreover, the nonuniformity of the fabrication makes the cavities in the array not resonate simultaneously. The inhomogeneous pump [11] and the nonuniformity of fabrication, both of which cause asynchronous lasing action, are responsible for the longer duration of the coupled-cavity laser.…”

Dependence of the modulation response of quantum dot based nanocavity devices on the number of emitters

“…Refs. [10,11] In the past, the analysis of the modulation response has been based on rate equations [12,13] or semiclassical Maxwell-Bloch equations [14]. It was claimed recently [15], but is being debated [13], that the highest modulation bandwidth is not achieved above threshold with a nanolaser but that a nanoLED, i.e.…”