Although terahertz (THz) radiation was first observed about hundred years ago, the
corresponding portion of the electromagnetic spectrum has been for long time considered a …

A density matrix approach is used in combination with a tight-binding model to describe
electron transport in terahertz quantum cascade lasers and is incorporated into a Monte …

We report the first demonstration of an all solid-state heterodyne receiver that can be used
for high-resolution spectroscopy above 2 THz suitable for space-based observatories. The …

One THz harmonic oscillation was observed in a sub-THz oscillating Ga In As∕ Al As
resonant tunneling diode integrated with a slot antenna. The fundamental and third …

The need to reach single-mode lasing and minimize at the same time the electrical
dissipation of cryogenically operated terahertz quantum cascade lasers may result in small …

We report terahertz quantum-cascade lasers operating predominantly at 1.90 THz with side
modes as low as 1.86 THz (⁠ λ≈ 161 μ m⁠, ℏ ω≈ 7.7 meV⁠). This is the longest …

We compare the electronic temperatures and the population inversion both below and
above the lasing threshold in three quantum-cascade lasers (QCLs) operating at 2.8 THz⁠ …

We present a highly diagonal “split-well resonant-phonon”(SWRP) active region design for
GaAs/Al_0. 3Ga_0. 7As terahertz quantum cascade lasers (THz-QCLs). Negative differential …

We report the operation of a 2 THz quantum cascade laser based on a GaAs/Al_0. 1Ga_0.
9As heterostructure. The laser transition is between an isolated subband and the upper state …

We report our development of terahertz (THz) quantum-cascade lasers (QCLs) based on two
novel features. First, the depopulation of the lower radiative level is achieved through …