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Entrainment of Micromechanical Limit Cycle Oscillators in the Presence of Frequency Instability
Limit cycles micromechanical devices optical resonators oscillators thermomechanical processes
2015/8/27
The nonlinear dynamics of micromechanical oscil-lators are explored experimentally. Devices consist of singly and doubly supported Si beams, 200nm thick and 35 μm long.When illuminated within a laser ...
Efficiency above the Shockley−Queisser Limit by Using Nanophotonic Effects To Create Multiple Effective Bandgaps With a Single Semiconductor
Photon management nanostructured solar cells Shockley− Queisser limit light trapping tandem solar cells
2015/8/6
We present a pure photonic approach to overcome the Shockley−Queisser limit. A single material can show different effective bandgap, set by its absorption spectrum, which depends on ...
Fundamental limit of light trapping in grating structures
Solar Energy Nanophotonics and photonic crystals Diffraction and gratings
2015/8/10
We use a rigorous electromagnetic approach to analyze the fundamental limit of light-trapping enhancement in grating structures. This limit can exceed the bulk limit of 4n2, but has significant angula...
Fundamental limit of nanophotonic light trapping in solar cells
nanophotonic light trapping solar cells
2015/8/10
Establishing the fundamental limit of nanophotonic light-trapping schemes is of paramount importance and is becoming increasingly urgent for current solar cell research. The standard theory of light t...
Quadrature Duobinary Modulation for 100G Transmission Beyond the Nyquist Limit
Fiber optics communications Coherent communications
2015/6/8
Quadrature duobinary (QDB) modulation with coherent detection is proposed for 112-Gb/s transmission systems. With proper system design for maximum spectral efficiency, we show that dual polarization Q...