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A terahertz amplitude modulator based on graphene on a metallic square ring resonant structure is proposed. By separating the graphene and the metallic structure with a thin organic dielectric layer, both the resonant frequency and the amplitude of the transmission resonant peak are modulated when graphene is electrically tuned by a bias voltage. A maximal amplitude modulation depth of 72% at the...
We demonstrate a high speed GeSi EA modulator with a broad operating wavelength range of over 30 nm near 1550 nm and a 3 dB bandwidth of 40.7 GHz at 2.8 V reverse bias.
The Lyapunov control law basing ellipse reference orbit is proposed, which is used to solving the control problem of the leader-follower satellite formation. An in-track direction drift transition formation is proposed for the leader-follower formation capture and reconfiguration. The Lyapunov control law is derived within the drift formation, and the system pole assignment is executed basing on the...
We present a high speed silicon micro-ring modulator with a tunable resonant wavelength enabled by a local heater. With a ~46 mW thermal tuning power, the working wavelength can expend to more than 100 nm.
We present a 12.5 Gbps silicon micro-ring modulator achieved by carrier depletion in a lateral pn diode. Tunability of the resonant wavelength is accomplished by means of a microheater, with an efficiency of 2.36 mW/nm.
The signal waveform design of wideband high frequency sonar is proposed. Using the ridge slope invariability property of wideband HFM signal, moving target parameter estimation is discussed. Real time results are presented and show the prospect of wideband HFM signals in underwater signal processing applications.
A liquid crystal spatial light modulator that operates from the ultraviolet (350 nm) to the mid-infrared (2400 nm) is described. The modulator is suitable for shaping the electromagnetic wave form of multioctave optical pulses.
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