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Unusual enhancement of mid-infrared light emission from CdTe/PbTe heterostructures is observed. It is discovered that the observed intense mid-infrared luminescence in the structures comes from the inherent polar interface character and coupling of surface plasmons localized at the metallic CdTe/PbTe interface to light emitted from the narrow gap PbTe.
Sub-wavelength coaxial aperture has been demonstrated as a simple technique for coupling terahertz (THz) radiation on a cylindrical metal wire. From the practical point-of-view, the structure of a coaxial aperture may have a misalignment of the inner conductor, which leads to an eccentric coaxial aperture. Making use of finite difference method (FDM) in bipolar coordinate system (BCS) and finite element...
We present a systematic analysis of geometry-dependent parasitics for THz sub-harmonic Schottky mixer diodes. In particular, the diode RF power coupling bandwidth has been studied, showing a trade-off between the air-bridge finger length and finger separation for operating frequencies beyond 1 THz.
A traveling-wave resonator may have many times the power supplied by a microwave source, making it possible to test components at a much higher power than would otherwise be available. Described here is a numerical study of a low-power traveling-wave resonator to consider some of the problems encountered in such high-power testing.
Recently, considerable studies have shown that plasmon induced transparency (PIT) effect can be realized by metamaterials via destructive interference between different resonance modes. Here we present a few recent developments of PIT research in terahertz metamaterials.
A graded grating is used to localize frequency components of a broadband THz source. We show spatial localization of the field within the grating. Further, various nano-antennas placed within the structure are amenable to detecting the trapped signal. This is verified using both time-domain and frequency-domain simulations in the range of 0.1–90 THz. The lifetimes of these trapped modes are found...
One possible way to realize high-temperature operation of terahertz quantum cascade lasers (THz-QCLs) is to introduce a new semiconductor material system instead of GaAs/AlGaAs. It is important to take into account not only longitudinal optical (LO) phonon energy of the material but broadening of subband levels caused by LO phonon-electron interaction. We propose a AlP/GaP-based THz-QCL structure...
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