We report on a compact, on-chip, and inexpensive Raman spectrometer platform that provides 6 orders of magnitude enhancement of Raman signal in the near-IR spectral range of 0.7-1.2μm with a laser excitation of 785 nm. It is based on microring resonators integrated with sinusoidal photonic crystal (MRR-SPC) both in the ring-resonator and in the bus waveguide. A low-loss Si3N4 waveguide is chosen to meet the requirements of high index contrast and ultracompact design. The proposed MRR-SPC can find its applications in bio/chemical ware fare sensing, chemical sensing, lab-on-a-chip systems for mobile and portable devices.
This paper reports on the characteristics of the plasmonic phenomena in diamond FET devices at THz frequencies. We present a detailed numerical study of the terahertz resonant response of n-diamond TeraFETs as a function of temperature and channel length, demonstrate their potential for emerging terahertz applications, and compare their performance with that for p-diamond devices. The results show that short channel n-diamond TeraFETs exhibit a resonant response at room and cryogenic temperatures. We also report on the impact of the amplitude of the impinged THz signal and gate-to-channel separation on the induced voltage response. In our analysis, we have accounted for the effect of the viscosity of the electron fluid in the channel which is one of the major contributors to the damping of the plasma waves.
We propose a chipless RFID pH sensor which can be easily integrated into a bandage for wound monitoring. The sensor can detect the pH level from 4 to 7 of the wounded area through frequency shift owing to the pH sensitive dielectric parameter of chitosan hydrogel, embedded into the substrate of the sensor. The substrate is composed of fabric material which makes it a strong candidate for non-invasive wound monitoring application. The frequency shift can be wirelessly detected by RFID reader to get the status of the wounded area.
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