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Amorphous silicon/crystalline silicon (a-Si/c-Si) micromorph tandem cells, with best confirmed efficiency of 12.3%, have yet to fully approach their theoretical performance limits. In this work, we… (More)
A short and broadband silicon asymmetric Y-junction two-mode (de)multiplexer is proposed and simulated. An adiabaticity parameter suitable for high index-contrast silicon waveguides is defined. The… (More)
Tandem solar cells consisting of high bandgap cadmium telluride alloys atop crystalline silicon have potential for high efficiencies exceeding the Shockley-Queisser limit. However, experimental… (More)
We report a 2×2 broadband and fabrication tolerant mode-evolution-based 3 dB coupler based on silicon-on-insulator rib waveguides. The operating principle of the coupler is based on the adiabatic… (More)
We propose a scheme to optimize the adiabaticity of silicon 3-dB couplers for broadband operation. Using inverse engineering based optimization, a 125 μm long silicon 3-dB coupler with a maximum… (More)
We propose a 3.2-µm-long taper with width varying from 0.5 µm to 2 µm and a 64-µm-long taper with width varying from 0.5 µm to 12 µm, achieving transmissions of 99.7% and 99.6%, respectively.
We propose a robust 2×2 3 dB waveguide beam splitter designed by shortcuts to adiabaticity. The beam splitter design is achieved by combining shortcuts to adiabaticity and perturbation theory. The… (More)
We propose an ultrashort and broadband silicon mode-conversion polarization splitter-rotator (PSR) consisting of a taper and a Y-junction both designed by the fast quasiadiabatic dynamics (FAQUAD).… (More)
We propose a scheme to optimize the adiabaticity of 3-dB couplers for broadband operation. Using shortcut to adiabaticity, a 3-dB coupler with a maximum imbalance of 0.2 dB from 1.25 to 1.6 µm is… (More)
We propose robust waveguide couplers by combining adiabatic elimination and the fast quasiadiabatic dynamics. The new fast quasiadibatic elimination (FAQUEL) coupler is short and have good robustness… (More)