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Recent advances of CMOS technology and circuits have made it an alternative for realizing capable and affordable THz systems. With process and circuit optimization, it should be possible to generate useful power and coherently detect signals at frequencies beyond 1THz, and incoherently detect signals at 40THz in CMOS.
Gamma Ray Bursts (GRBs) are the strongest explosions in the universe which might be associated with creation of black holes. Magnetic field structure and burst dynamics may influence polarization of the emitted gamma-rays. Precise polarization detection can be an ultimate tool to unveil the true GRB mechanism. POLAR is a space-borne Compton scattering detector for precise measurements of the GRB polarization...
To evaluate terahertz emission from intrinsic Josephson junctions, we used a YBa2Cu3O7−δ (YBCO) grain boundary Josephson junction as a terahertz detector. Shapiro steps have been clearly seen on the current-voltage curves of the YBCO junction irradiated with the emission from either a VDI-Tx-S140 transmitter (tens of μW at 620 GHz) or a Bi2Sr2CaCu2O8−x stack (25 μW at 500 GHz). While the harmonic...
Despite a continuously increasing demand, neutron electronic personal dosimeters (EPDs) are still far from being completely established because their development is a very difficult task. A low-noise, ultra low power consumption CMOS pixel sensor for a future neutron personal dosimeter has been implemented in a 0.35 μm CMOS technology. The prototype is composed of a pixel array for detection of charged...
In this paper we compared both the timing resolution and the 2-dimension (2D) decoding map of two different reflector patterns of PMT-Quadrant-Sharing (PQS) block to obtain an optimized detector design for Time-of-Flight (TOF) PET application. Light reflectors (ESR mirror film from 3M Co.) in a PQS scintillation crystal block control the light-sharing ratio and light spread angle to the PMTs that...
High volume millimeter wave applications are emerging. With the speed improvement of CMOS, sub-millimeter wave operation of CMOS circuits appears to be possible. In traditional millimeter and sub-millimeter wave systems, discrete Schottky diodes are widely utilized. This paper reviews the high frequency performance of junction and Schottky diodes fabricated in CMOS without any process modification,...
We describe near infrared spectroscopy (NIRS) to study spatial variations in tissue oxygenation: oxyhaemoglobin (HbO2); deoxy-haemoglobin (HHb); and total haemoglobin (Hbtot). Apparatus was constructed incorporating light-emitting diodes (LED) as the light sources, sensitive photodiodes (PD) as the detectors, a virtual instrument to control the opto devices and collect and process the signals. The...
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