Temperature performance analysis of terahertz quantum cascade lasers: Vertical versus diagonal designs

TL;DR

This study compares vertical and diagonal terahertz quantum cascade lasers using Monte Carlo simulations, revealing that diagonal designs perform better above 200 K at higher frequencies, while vertical designs excel at lower frequencies.

Contribution

It provides a systematic comparison of vertical and diagonal QCLs' temperature performance using ensemble Monte Carlo methods, highlighting frequency-dependent advantages.

Findings

Diagonal designs outperform vertical ones above 200 K at ~3.5 THz.

Vertical structures are better for lower frequencies and temperatures.

Performance depends on lasing frequency and temperature.

Abstract

Resonant phonon depopulation terahertz quantum cascade lasers based on vertical and diagonal lasing transitions are systematically compared using a well established ensemble Monte Carlo approach. The analysis shows that for operating temperatures below 200 K, diagonal designs may offer superior temperature performance at lasing frequencies of about 3.5 THz and above; however, vertical structures are more advantageous for good temperature performance at lower frequencies.