A terahertz (THz) antenna is proposed that offers high input resistance and gain in the presence of an electrically thick GaAs substrate. The antenna is centrally fed using two vertical probes connected to a photomixer on a thin low temperature grown gallium arsenide (LTG-GaAs) film which is supported by the GaAs substrate. An input impedance of ∼ 3.3 kΩ has been achieved using a dipole antenna...

Due to their attractive properties, silver nanowires (Ag-NWs) are newly used as nanoelectrodes in continuous wave (CW) THz photomixer. However, since these have small contact area, the fill factor photomixer active region is low, which leads reduce conductivity. In this work, we proposed add graphene nanoantenna array nanowires-based improve addition, and form new hybrid for CW-THz leading devi...

We report photomixer devices fabricated on a material consisting of self-assembled ErAs islands in GaAs, which is grown by molecular beam epitaxy. The devices perform comparably and provide an alternative to those made from low-temperature-grown GaAs. The photomixer’s frequency response demonstrates that the material is a photoconductor with subpicosecond response time, in agreement with time-r...

II. THEORY AND SIMULATION Abstract— A novel THz device concept called as CW HTS (high temperature superconductive) photomixer/antenna is proposed. Optical heterodyne photomixing in the DC-biased HTS strip has been employed to create THz signal, and the size of the strip on the grounded dielectric substrate is designed to have an efficient broadside radiation. Incorporating the HTS microstrip co...

We experimentally investigated terahertz photomixing operation at room temperature in an InGaP/InGaAs/ GaAs two-dimensional plasmon-resonant photomixer incorporating grating-bicoupled dual-gate structure. Photoelectrons drifting into a high-density plasmon cavity grating from an adjacent low-density one extensively excite the plasmon resonance, resulting in emission of terahertz radiation. A ve...

Over the last two decades, photomixer-based continuous wave systems developed into versatile and practical tools for terahertz (THz) spectroscopy. The high responsivity to THz field amplitude of is predetermined by homodyne detection principle that allows system have sensitivity. Here, we show advantages can be exploited with broadband power detectors combined photomixer sources. For this, empl...

A compact cw Tm,Ho:YLF laser with single-mode tunability over +/4 GHz has been developed into a modular unit containing an isolator and photomixer for offset tuning of the LO from a master oscillator which controls the frequency of a Doppler lidar transmitter. This and an alternative diode laser LO will be described,

The increase of device lifetime and reliability THz photomixers will play an essential role in their possible future application. Therefore, optimal work conditions/operation range, i.e., the maximal incident optical power should be experimentally estimated. We fabricated tested photomixer devices based on nitrogen-implanted GaAs integrated with a Bragg reflector. Raman spectroscopy was applied...

Accurate circuit models derived from electromagnetic simulations have been used to fabricate photomixer sources with optimized high-impedance antennas. Output powers on the order of 1 W were measured for various designs spanning 0.6–2.7 THz. The improvement in output power ranged from 3 to 10 dB over more conventionally designed photomixers using broad-band log-spiral antennas. Measured data on...