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Frequency measurement based on dual THz frequency combs of photocarrier (dual PC-THz combs) is a promising method for the real-time measurement of the absolute frequency in CW-THz radiation without the need for cryogenic cooling. However, use of dual femtosecond lasers hinders the practicability of this method. In this paper, we generated dual PC-THz combs using a free-running, dual-wavelength mode-locked...
We present the first results of a planar Gunn diode made in on an InP substrate, operating at a fundamental frequency up to 164 GHz. For a 120--wide device with a 1.3- active channel length, the highest power achieved was approximately 10 dBm at 164 GHz.
We report a 9.1 GHz fiber-based RF frequency dissemination chain over 80 km. Using an improved phase noise compensation scheme, the frequency dissemination stability has been improved from 4×10−17/105 s to 1.1×10−18/105 s.
This paper reports a kind of intercoupled silicon dual-microcantilevers for ultrasensitive mass detection based on the relative change in the amplitude ratio of the out-of-phase vibration eigenstate of the dual-cantilevers. The structural intercoupling of the dual-cantilevers arises from the coupling overhang connecting them at the base. The whole structure operation is excited by a piezoactuator...
Traditionally, the most precise way to get the mutual inductance value is by a calculable mutual inductor. Here a new approach of measuring the mutual inductance at low frequency with compensation method is described. The mutual inductance is traced to the value of the frequency and resistance directly. The measurement uncertainty is 0.1 ppm and could be improved further.
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