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We demonstrated the enhanced terahertz transmission through superconducting NbN subw ave length hole arrays. The transmission peak value and frequency exhibit thermal tuning behaviors, which can be attributed to the temperature-dependent complex permittivity of superconducting film. The microscopic hybrid wave model was adopted to analyze the role of surface waves in the enhanced transmission theoretically...
High performance biosensors for the detection of bacterial in various media have been developed using magnetostrictive/magnetoelastic resonators (MSRs). An MSR is a strip of magnetostrictive alloy coated with biological molecular recognition unit, such as antibody and phage. The sensor is based on the change in its resonant frequency. Therefore, it is critical to determine the resonant frequency of...
This paper reports on the design and implementation of a complete battery-operated wireless system for a mechanically resonant gas sensor based on a capacitive micromachined ultrasonic transducer (CMUT) array. A custom-designed front-end integrated circuit (IC) with eight inputs and a serial peripheral interface (SPI) was tightly integrated with a CMUT array. The power consumption of the front-end...
In this study we extend our work on low-power CMUT chemical sensors from a single element to an array as a way to improve selectivity to volatile organic compound (VOC) analytes. A single channel of our sensor array comprises of a polymer-functionalized CMUT resonator in the feedback loop of a Colpitts oscillator, which consumes 0.76 mW, when operated continuously. Using our anodic-bonding based fabrication...
In this work we present a complete end-to-end interface for a capacitive micromachined ultrasonic transducer (CMUT) intended for low-power gas sensing applications. A prototype chip was designed in a 0.18-μm BiCMOS process. Different blocks (a BJT-based Colpitts oscillator, an inverter-based oscillator, a sine-to-square wave converter, a digital frequency counter, and a parallel-to-serial converter)...
A new and miniaturized narrow bandpass filter (BPF) with very wide upper stopband is proposed. The filter consists of an open-loop resonator with the broadside coupled microstrip/slot hybrid unit and a microstrip open-loop resonator with short-circuited units, and the two resonators are edge-coupled to improve the performance of the filter. The effective area of designed filter is about 40.4×20 mm...
We present the design, fabrication and characterization of a highly flexible metamaterial absorber that experimentally obtains an absorptivity of 0.96 at 1.6 THz and operates over wide angular range for transverse electric and transverse magnetic radiation.
In this paper, we present a metamaterial with simultaneously negative electric and magnetic resonance responses in the terahertz (THz) frequency range. The structure is composed of in-plane split resonator rings (SRRs) for desired electric response and out-of-plane SRRs realized by bimaterial pop up structures for magnetic response. Experimental results conducted using THz Time Domain Spectroscopy...
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