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High peak power THz radiation with tunable spectral bandwidth is produced at SPARC_LAB as coherent radiation (CR) from relativistic, short (100 fs) electron bunches. The CR spectrum is characterized through frequency-resolved techniques.
We present ultra-wideband zero-bias Schottky diode detector modules with monolithically integrated log-spiral antenna. Detectors exhibit a broad-band response with a stronger roll-off above 800 GHz and the minimum noise-equivalent power of 10 pW/√Hz. The intrinsic diode response time to a short THz radiation has been measured to be less than 25ps.
Two Er-doped-GaAs photoconductive (PC) switches have been studied in extrinsic mode with different Er fractions of 1% and 2%. The PC switches were driven with a 1550 nm ultrafast laser (hν = 0.56 UG, UG = 1.42 eV for GaAs) and exhibited different THz bandwidths and photoelectric responsivities. These experiments are aimed at optimizing the new extrinsic mode of generating THz radiation in ErAs:GaAs...
Terahertz photoconductive antennas are fabricated on low-temperature-grown GaAs, low-temperature-grown In0.3Ga0.7As, and beryllium (Be) doped low-temperature-grown lattice-matched In0.53Ga0.47As-In0.52Al0.48As multi-quantum wells material systems for 800 nm, 1000 nm, and 1550 nm operation wavelengths. Several narrow band and broad band antenna designs are fabricated and tested under pulse and cw excitation,...
A travelling-wave photomixer was realized. The responsivity was 0.42A/W for 15µm length device. It showed a 3dB bandwidth of more than 200GHz, limited by transit-time of photo-generated carriers. Also, it showed a successful THz wave generation up to frequency range of more than 500GHz.
In this paper, we have presented the simulation results on a novel metamaterial absorber, which can work in the terahertz regime. The results show that the absorber has a smooth broadband absorption peak of 400GHz with the absorptivity over 95%.
We report on the design and development of a PPM integrated 233 GHz staggered vane sheet beam TWTA [1, 2]. The permanent magnetic (NdFeB) based focusing lens structure for the sheet electron beam transport has been designed for a gun operated at 19 kV. For a beam tunnel of 830 µm * 160 µm, a transmitted current of ∼ 200 mA is achieved for > 40 mm length channel. For 19 kV operation, the TWTA circuit...
The photomixers enables continuous-wave, frequency-tunable terahertz (THz) emitter and detector by using conventional photonics technology. To increase the emission and detection efficiency, various antennas have been adopted. In this work, we provide experimental characterizations of various kinds of antenna-integrated photomixers by measuring reference THz pulse from an InAs crystal.
This article describes a 16QAM modulation based 3Gbps wireless communication demonstration system at 0.34 THz band, which consists of a 0.34 THz wireless communication transceiver front end based on solid-state semiconductor, an IF updown converter, and a digital signal process unit. The transmitted signal carrier of this demonstration system is centered at 0.34 THz, the output power is −20dBm, the...
The user FELIX Facility Nijmegen offers four FEL beam lines, FLARE from 0.2 to 3 THz, FELIX-2 from 12 to 75 THz, FELIX-1 from 2 to 12 THz and FELICE, a special beam line for intra-cavity experiments from 3–75 THz
A pulse prototype of a W-band TE01 mode gyrotron traveling-wave tube (gyro-TWT) amplifier is designed, and it features high gain and broadband capabilities. Theoretical investigation predicts that, when the magnetic injection gun (MIG) is optimized to generate an electron beam of voltage 70 kV, current 3 A, high pitch factor 1.5, and low axial-velocity spread about 5%, the gyro-TWT amplifier is of...
Various predesigned terahertz spectra can be generated via optical rectification of laser pulses in aperiodically poled crystals. The opportunity to manage the terahertz spectrum via the crystal domain structure is stored when the femtosecond transform-limited optical pulses are replaced by the non-transform-limited pulses of the same spectral bandwidth.
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.
In this presentation, we proposed an all-optical broadband THz modulator based on single-layer graphene (SLG) on silicon. By illuminating the film with CW laser, the THz transmission decreased significantly. The modulation speed was measured at 340GHz to be as high as 0.5 MHz. This modulator has huge potential for real application.
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