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Optical clock interrogation protocols, based on laser-pulse spectroscopy, are suffering from probe-induced frequency-shifts and their variations induced by laser power. Original Hyper-Ramsey probing scheme, which was proposed to alleviate those issues, does not apply below fractional frequency changes of 10−18 when decoherence and relaxation by spontaneous emission or collisions are present. We present...
In this paper, the noise temperature and IF bandwidth of a 1.4 THz twin-slot antenna coupled NbN superconducting HEB mixer are thoroughly investigated. The RF noise and conversion gain of the HEB mixer have been measured and analyzed. An anti-reflection coating has been applied on the elliptical lens to reduce the RF noise, the measured lowest noise temperature (450 K) achieves state-of-the-art sensitivity...
In this paper, we present a low noise integrated heterodyne receiver at 2.7 THz. This heterodyne receiver is based on a superconducting hot electron bolometer (HEB) mixer and a low power consumption quantum cascade laser (QCL) that are both integrated on the same 4 K stage of a pulse tube cooler. We measured the noise temperature of the HEB/QCL integrated heterodyne receiver by using hot and cold...
This paper presents theoretical study and experimental results of fully integrated thermally actuated diaphragm. Finite element method (FEM) has been used to simulate and optimize the performance of the actuated diaphragm. It predicts the deflection behavior under definite power actuation and pressure. Heat transfer analysis is conducted to evaluate temperature field distribution. Some structures...
The paper presents a panel discussion from the distinguished members of the electronics industry as they outline the platforms and priorities that the industry would like from the incoming administration of the United States of America. The discussion was framed in a way to help explain what is to be expected from the new administration.
We propose a new version of electro-optic sampler at 1.5 mum, which uses an ion-irradiated InP-based photoconductor for the optical-to-electrical conversion. A measurement bandwidth larger than 300 GHz is obtained for a signal-to-noise ratio higher than 15 dB and excitation pulses of peak amplitude as high as 0.81 V. The performances of our system are validated from test measurements performed on...
An eight stage distributed amplifier with 12.5 dB /spl plusmn/ 0.45 dB gain and 50 GHz bandwidth has been demonstrated in a commercially available 0.1 /spl mu/m metamorphic GaAs HEMT (MHEMT) technology. The amplifier has a minimum noise figure lower than 2.5 dB in the bandwidth. The group delay variation from 9 to 40 GHz is /spl plusmn/ 7.5 ps and circuit consumption is 0.4 W. Such amplifier has been...
An eight stage distributed amplifier with 12.5 dB plusmn 0.45 dB gain and 50 GHz bandwidth has been demonstrated in a commercially available 0.1 mum metamorphic GaAs HEMT (MHEMT) technology. The amplifier has a minimum noise figure lower than 2.5 dB in the bandwidth. The group delay variation, from 9 to 40 GHz is plusmn 7.5 ps and circuit consumption is 0.4 W. Such amplifier has been packaged with...
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