Cryogenic Temperature Nanoscopic Voltage Profiling of Operating Teraherz Quantum Cascade Laser Devices

摘要

A nanoscopic probing technique to measure voltage drop across an operating device in cryogenic temperature conditions has been developed and established. The cross section surface of the terahertz (THz) quantum cascade laser (QCL) is profiled to resolve the voltage distribution at nanometer scales. The electric field distribution across the active region of the device has been attained under lasing conditions.