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On-off optical switching based on the Bloch-surface-wave enhanced Goos-Hanchen effect is demonstrated for the first time by changing the medium in a flowcell that serves as the cladding of a truncated one-dimensional photonic crystal.
The incidence of cancer is predicted to increase dramatically in the next decades. This increase is associated with an aging population - cancer is primarily an age related disease - and with improvements in detection and treatment strategies that cause cancer to be detected earlier and patients to be treated longer.
We report an optical cavity-based biosensor utilizing differential detection for increased sensitivity, lower cost, and multiplexing capability. Calculated differential values show linear and monotonic change for the sensing layer thickness with a sensitivity of 0.061/nm.
We demonstrate fast optical arbitrary waveform generation by using MEMS digital micro-mirror arrays. Experimentally, we obtain ∼120MHz waveforms that can be controlled by using 1024×768 mirror arrays. 1GHz waveforms reconfigurable in 1µs are also achievable.
We present a photoreceiver optimized for use in analog applications requiring highly linear operation and high rf-output power. The analog photoreceiver exhibits an rf-output power exceeding +20 dBm at a central frequency of 54 GHz.
Phase conjugation can be used to correct blurred images caused by atmospheric turbulence and scattering of light by biological tissues. In the past, phase-conjugation devices based on photorefractive effect have response times of 100 µs – 1 s [1]. Four-wave mixing in a third-order nonlinear medium can be also used to achieve optical phase conjugation [2]. This scheme, demonstrated in Ref. [3], requires...
In the last several years, rapid advances have been made in the field of cavity optomechanics, in which the usually feeble radiation pressure force of light is used to manipulate (and precisely monitor) mechanical motion [1–3]. These advances have moved the field from the multi-km interferometer of a gravitational wave observatory, to the optical table top, and now all the way down to a silicon microchip...
A new technique to design ultra-broadband (∼THz) all-optical signal processing devices based on linearly chirped fiber Bragg gratings operated in transmission is presented. Efficient and feasible Nth-order differentiators are numerically demonstrated based on this technique.
Novel optical dispersion spectroscopy has been developed with a dynamic range of 2500 ps/nm and a resolution of < 1 ps/nm. It was realized using dual-heterodyne mixing with 25 GHz- and 2 GHz-optical frequency combs.
The reflection at the optical connector in the high-power range was experimentally verified using Coherent-OTDR for the first time. The result shows less reflectivity at the connecter with black paint in a higher power range.
We report the first experimental observation of periodic oscillations in an optically spin-injected GaInNAs/GaAs 1300 nm VCSEL under CW pumping and operated at room temperature. We show that the stability of the VCSEL can be controlled with the pump ellipticity. 11 GHz periodic oscillations were observed with the device subject to circularly-polarized (left or right) optical pumping. The highest RF...
Realization of high-efficiency optical device on Si integrated circuit is required for novel optoelectronic integrated circuit (OEIC)[1,2]. AlxGa1−xPN alloy, which can lattice-match to Si, is fascinating for realization of lasers on Si as schematically shown in Fig.1, because of its potentials of carrier and optical confinement at the heterointerface. In this study, development of GaPN/AlGaPN heterostructures...
In micro-fluidic devices, a small amount of fluid flows along the pre-determined channels to be chemically analyzed, or to activate mechanical/optical functions. Such devices have been extensively used in biochemistry, medical science, and optical engineering. One of the essential techniques in micro-fluidics is to monitor the fluid flow with high accuracy. Currently the flow can be analyzed using...
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