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A high-sensitivity sensing scheme based on Bloch surface wave at a one-dimensional photonic crystal surface is demonstrated with the simple intensity interrogation configuration achieving a detection limit as low as 7.5*10−7 RIU.
Flexible 2D grating with nano-pyramids array used for in-situ and highly sensitive measurement of refractive index and pressure of fluid is demonstrated for potential application in blood monitoring in dialysis.
The a-Si:H deposition process is systematically investigated in intrawafer and wafer-to-wafer experiments. Photonic ring resonators were studied within-chip and chip-to-chip, showing ±1.2nm resonance peak variations and deviations of 0.25% (intrachip) and 0.9%(interchip) for group index and FSR.
We present a method for accurate determination of refractive indices of waveguide core and cladding layers using reflective microrings. The resonant mode azimuthal order ambiguity is resolved by introducing a grating on the microrings.
The effects of thermally-induced refractive index change on distributed modal filtering rod-type photonic crystal fibers are numerically investigated. Results have shown a significant blue-shift of the single-mode range for increasing temperature.
Reported here are optical fibers exhibiting significant longitudinal changes in optical properties over short lengths. The Brillouin gain is found to decrease by over 6 dB relative to a standard optical fiber as a result
This study describes a novel technique for performing digital holographic microscopy with nano-meter axial resolution. The high-resolution digital holographic microscopy is applied to the three-dimensional tomographic imaging of refractive index inside an object.
We demonstrate a giant phase-shift in a slow-light Bragg reflector waveguide. A low polarization dependence of group index is clearly shown. We observed a large phase shift over 4p in 20µm-long waveguide thanks to slowing light.
Efficient conversion between fundamental and high-order modes propagating in multimode optical fiber is important for applications in nonlinear optics. For example, up-conversion in a nonlinear waveguide can be exploited for reaching single-photon detection levels [1]. However, high-order modes could result in destructive interferences among the up-converted modes [2]. On the other hand, it is equally...
Guided-mode resonance sensors employing modal-polarization diversity are presented. In an application example, we quantify the variations in the refractive index of an attaching biolayer and show that the background is stable.
The light extraction efficiency of InGaN light-emitting diodes employing microsphere arrays with different refractive indices and diameters were studied, and the use of anatase TiO2 microsphere arrays resulted in 2.4-times increase in light extraction efficiency.
We design integrated holographic filters with any transfer function by weakly modulating the top cladding of SOI waveguides. Our calculations are confirmed by full-vectorial simulations. Grating are fabricated with focused ion beam.
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