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Improving photoconductive receivers for 1.5 μm CW THz systems
2010 Edition, September 1, 2010 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Implementation of interdigital electrodes and etching isolating trenches has improved InGaAs/InAlAs photoconductive antennas. The signal-to-noise ratio of continuous wave systems at 1.5 µm has been increased up to 80 dB and its operation range up to 2.1 THz.

Improved InGaAs/InAlAs photoconductive THz receivers: 5.8 THz bandwidth and 80 dB dynamic range
2014 Edition, June 1, 2014 - Optical Society (The) (OSA)

We investigate optimal Be-doping conditions of low-temperature-grown InGaAs/InAlAs photoconductive antennas with respect to their carrier lifetimes and carrier mobility. Employed as THz-TDS receiver bandwidths of 5.8 THz with a dynamic range of up to 80 dB is achieved.

Photoconductive Cw THz receiver with 20-fold increased THz conversion efficiency
2013 Edition, September 1, 2013 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Photoconductive cw THz receivers with buried interdigital finger contacts feature a 20-fold higher conversion efficiency than their planar counterpart. Applied to a 1.5 μm cw THz photomixing system, a SNR up to 95 dB @ 100 GHz was achieved.

The photomixer transceiver
1998 Edition, January 1, 1998 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In the time domain, terahertz photoconductive sampling has been used by many groups for spectroscopy in free space and on transmission lines over several THz of instantaneous bandwidth. These systems consist of two fast photoconductive switches that are excited by...

17.7 A packaged 90-to-300GHz transmitter and 115-to-325GHz coherent receiver in CMOS for full-band continuous-wave mm-wave hyperspectral imaging
2017 Edition, February 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Millimeter-wave/THz hyperspectral imaging has numerous applications in security, non-destructive evaluation, material characterization, and medical diagnostics [1]. Unlike single-frequency imaging, hyperspectral imaging operates over a wide frequency range and offers spectroscopic...

Compact CW THz spectroscopy system and its application in water absorption measurements
2017 Edition, June 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Compact, cost-effective and frequency-tunable continuous-wave (CW) THz systems are preferable for spectroscopic applications such as atmospheric remote sensing and molecular spectral analysis [1]. Usually, one uses two distributed feedback (DFB) lasers with...

Phase-slope measurement of tunable CW-THz radiation and application for distance measurement of optically rough object
2011 Edition, May 1, 2011 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We demonstrate phase-slope measurement of tunable CW-THz radiation by photoconductive heterodyne detection with a photocarrier THz comb. Distance of optically rough object is determined from the measured phase-slope within accuracy of 100 μm.

Design and characterization of evanescently-coupled photodiodes for 1.3 μm wavelength
2014 Edition, September 1, 2014 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The evanescently coupled waveguide photodiode (ECPD) has been fabricated and used for the generation of continuous-wave (CW) terahertz (THz) field at a 1.3 μm wavelength. We designed a matching layer to evanescently couple the optical beam from the base waveguide to the...

CW mid-IR OPO based on OP-GaAs
2013 Edition, May 1, 2013 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Summary form only given. Orientation-patterned GaAs (OP-GaAs) has grown in importance over the last decade as a quasi-phasematched (QPM) nonlinear optical (NLO) material for frequency conversion applications in the mid-infrared. OP-GaAs is attractive due to its high nonlinearity...

Monolithically integrated two-wavelength distributed Bragg reflector laser for terahertz generation
2016 Edition, June 1, 2016 - Optical Society (The) (OSA)

We demonstrate a monolithically integrated 1.55-μm two-wavelength distributed Bragg reflector (DBR) laser chip with integrated SOA for CW terahertz optical heterodyne signal generation. Continuous frequency tuning ranging from 0.06 THz-0.71 THz was obtained.

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