Ralph W. Young

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Vertical junction resonant microdisk modulators and switches have been demonstrated with exceptionally low power consumption, low-voltage operation, high-speed, and compact size. This paper reviews the progress of vertical junction microdisk modulators, provides detailed design data, and compares vertical junction performance to lateral junction(More)
A new class of microphotonic-resonators, Adiabatic Resonant Microrings (ARMs), is introduced. The ARM resonator geometry enables heater elements to be formed within the resonator, simultaneously enabling record low-power (4.4 W/GHz) and record high-speed (1µs) thermal tuning.
The first demonstration of a silicon microring modulator with both an integrated resistive heater and diode-based temperature sensor is shown. The temperature-sensor exhibits a linear response for more than an 85°C external temperature range.
In this Letter, we propose and demonstrate a high-speed and power-efficient thermo-optic switch using an adiabatic bend with a directly integrated silicon heater to minimize the heat capacity and therein maximize the performance of the thermo-optic switch. A rapid, τ=2.4 μs thermal time constant and a low electrical power consumption of P(π)=12.7 mW/π-phase(More)
We present the Quantum Computer Aided Design (QCAD) simulator that targets modeling quantum devices, particularly Si double quantum dots (DQDs) developed for quantum computing. The simulator core includes Poisson, Schrodinger, and Configuration Interaction solvers which can be run individually or combined self-consistently. The simulator is built upon(More)
Silicon resonant microdisk and microring modulators and switches based on free-carrier depletion and injection were designed and fabricated with the aim of minimizing device radius to theoretical bend-radiation imposed limits. Minimizing device area serves to simultaneously maximize resonator free-spectral-range, minimize switching energy, and maximize(More)
The limits to silicon modulator bandwidth and power consumption are explored. Traditional electrical interconnects provide insufficient bandwidth (~10Gb/s) and consume far too much power (~10pJ/bit) for future high performance computing applications. Microphotonic devices closely integrated with advanced CMOS electronics have the potential to dramatically(More)
Quantum dot (QD) layouts are becoming more complex as the technology is being applied to more sophisticated multi-QD structures. This increase in complexity requires improved capacitance modeling both for the design and accurate interpretation of QD properties from measurement. A combination of process simulation, electrostatic simulation, and(More)
We present the Quantum Computer Aided Design (QCAD) simulator that targets modeling multi-dimensional quantum devices, particularly silicon multi-quantum dots (QDs) developed for quantum bits (qubits). This finite-element simulator has three differentiating features: (i) its core contains nonlinear Poisson, effective mass Schrodinger, and Configuration(More)