Six years after their birth, terahertz quantum-cascade lasers can now deliver milliwatts or
more of continuous-wave coherent radiation throughout the terahertz range—the spectral …

Silicon germanium (SiGe) has moved from being a research material to accounting for a
small but significant percentage of manufactured semiconductor devices. This percentage is …

Silicon microphotonics, a technology which merges photonics and silicon microelectronic
components, is rapidly evolving. Many different fields of application are emerging …

An extraordinary combination of material science, manufacturing processes, and innovative
thinking spurred the development of SiGe heterojunction devices that offer a wide array of …

Terahertz (THz) quantum cascade lasers (QCLs) are currently the most advanced
electrically pumped semiconductor lasers in the spectral range 1-5 THz. However, their …

A review is presented of work over the last 10 years which has been aimed at trying to
produce a Si‐based THz quantum cascade laser. Potential THz applications and present …

The effect of intrasubband interface roughness scattering on intersubband transition
linewidths in double-quantum-well and quantum-cascade (QC) structures is studied. In n …

We demonstrate p-type SiGe quantum well infrared photodetectors (QWIPs) on a strained-
silicon-on-insulator (sSOI) substrate. The sSOI system allows strain-balancing between the …

SiGe quantum wells are promising candidates for the development of intersubband light
emitters and photodetectors operating at mid-and far-infrared wavelengths. By virtue of their …

In this paper, we review the recent progress in broadly tunable single-mode mid-infrared
quantum cascade lasers (QCLs). With a brief introduction on various applications of broadly …