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This paper describes a new type of imaging, which is referred to as serial time encoded amplified microscopy (STEAM). The ultrafast real-time imaging capability of the STEAM camera is employed to capture fast microfluidic flow and laser ablation. Recent results are presented from STEAM-based flow cytometry, which lead towards detection of rare cells in a large population of normal cells.
We provide a new theoretical estimation of stress-induced chi(2) in silicon and highlight the fact that there exists a large difference between theoretical and experimentally measured values. Possible reasons for this discrepancy are discussed.
As a centrosymmetric crystal, bulk silicon lacks the crucial second-order nonlinearity chi(2) - the cornerstone of parametric light conversion. Although it has been demonstrated that mechanical stress can create chi(2) effects, efficient parametric chi(2) processes require a means to achieve phase matching. A powerful approach for efficient parametric conversion is quasi-phase matching (QPM) by periodic...
We present an imaging method that maps a 2D image into a serial time-domain waveform and simultaneously amplifies it optically. Continuous real-time images at a record frame rate of 6.1 MHz are captured using an oscilloscope.
We propose a new class of photonic devices based on periodic stress fields in silicon. Our approach creates quasi-phase matched second-order nonlinear processes that can be used, for example, for efficient midwave-infrared generation.
We demonstrate an endoscope-compatible, mechanical-scan-free microscopy technique and its application as a highly flexible fiber probe which can simultaneously perform imaging and high precision in-situ laser microsurgery.
This paper is the first report on dynamic control of birefringence in silicon-on-insulator (SOI) waveguides by electronically tuning the stress in the waveguide. The dynamic stress is induced by a thin-film piezoelectric transducer integrated on top of the waveguide. Integrated piezoelectric transducers are used to electrically vary the dispersion in a silicon optical waveguide.
The theory of nonlinear photovoltaic effect is developed and compared with experiments. By harvesting the optical energy lost to two-photon absorption, this new photovoltaic effect offers an energy-efficient solution in nonlinear silicon photonics.
Two-photon absorption is the central problem in silicon photonic devices. Two-photon photovoltaic effect can be used to harvest the lost optical power into useful electrical power.
Optical amplification, wavelength conversion, and a myriad of other functions that were once considered to be beyond silicon's reach have been made possible by the material's nonlinear optical properties. The common feature of such devices is the high optical intensity that is required to induce the nonlinear optical interactions. Concurrent with the useful nonlinearities (Raman and Kerr) are two-photon...
We propose two-dimensional photonic-crystal-embedded microcavities. Numerical simulations of waveguide-coupled square microcavities with square lattice of holes reveal spatially selective high-Q resonances with maximum internal field intensity about two orders of magnitude of the input field
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