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We measured the membrane roughness of neuroblastoma cells by non-interferometric wide-field optical profilometry. We found that the peptide related to Alzheimer's disease, Amyloid-beta 42, reduces membrane roughness, but direct-current electrical fields recover this effect.
We developed GPU(Graphics Processing Unit) processing to display correlation mapping OCT images in real-time. A display rate of 91 frames per second for processed images (1024 FFT size × 512 lateral A-scans) was achieved.
Based on pump-probe technique (PPT), we observed stimulated Brillouin scattering (SBS) in a 100-m-long silica graded-index multimode optical fiber with the same core diameter as that of a perfluorinated graded-index polymer optical fiber (PFGI-POF) (= 50 μιη). The SBS threshold was measured to be −50 mW, which was much lower than 5.08 W, the SBS threshold obtained for the same fiber without PPT. This...
A non-mechanical axial scanning laser Doppler velocimeter (LDV) with directional discrimination using a single transmission path is proposed. The axial scan and directional discrimination has been demonstrated experimentally using a sensor probe setup.
We proposed wavelength-scanning surface plasmon microscopy for the application of micro/nanobubble detection. We demonstrated that the bubble layer's position localized at a substrate's surface could theoretically be identified in a vertical direction.
A laser-induced repetitively operated fast neutron source was developed by using a deuterated polystyrene film target and a femtosecond laser with a peak output power of approximately 24 TW and was applied for laser activation analyses of indium and gold samples. By using a home-made gated scintillation detector, the developed neutron source was estimated to have a neutron yield of approximately 4...
We numerically study the dynamics of supercontinuum generation for four types of conventional fiber laser pulses. Our results show that in anomalous dispersion pumping regimes a dechirped parabolic pulse generates the broadest output spectrum.
A new algorithm is proposed to accurately reconstruct the spectral phase from frequency-resolved optical gating (FROG) traces seriously distorted by crystal dispersion and rippled phase-matching spectrum for the fist time (to our best knowledge).
By introducing the symmetry-breaking in geometry, we reveal the existence of thresholdless crescent waves, i.e., nonlinear surface modes pinged to the boundary of a curvature, in an elliptical ring. An effective nonlinear Schrödinger equation along the azimuthal direction is derived by taking the transformation in the curvilinear coordinate of elliptical symmetry, which illustrates the formation of...
We present a simple technique for obtaining a broad and flat Brillouin gain spectrum (BGS) in optical fibers. By modulating the driving current of a pump laser diode with triangular waveform, a BGS with lower than 0.3 dB gain variation over > 200 MHz is achieved, which is, to the best of our knowledge, the flattest BGS ever reported. With this technique, the bandwidth of the flattened BGS can be...
Post-fabrication tuning of silicon microring resonators is accomplished using single fs laser pulses at 400nm with a tuning rate of 20nm/J·cm−2. The resonance mismatch of a 2nd-order microring filter is also corrected.
Strong optical confinement to the low-index slot, such as ErxY2−xSiO5, is expected for TM mode in Si slot waveguide. The confinement effect causes the optical mode density modification, resulting in the enhancement of radiative transition. We have fabricated slab Si-slot waveguides with Er2SiO5 slot layers in order to demonstrate the dependence of radiative emission on the guided waveguide modes....
We studied a whispering-gallery-mode octagonal silica toroidal microcavity and found two different modes, one of which exhibits a high Q of 8.8×106. We also demonstrated it experimentally and obtained a Q of 2.2×104.
Waveguide crossing based on a tilted multimode-interference (MMI) structure in high-index-contrast silicon wire is reported. For low crosstalk and low loss, crossing angle of MMIs is optimized. The measured crosstalk with the optimal crossing angle of 110° is −44 dB at wavelength of 1550 nm. This corresponds to improvement by more than 14 dB from previously reported crosstalk with 90°-crossings of...
One-dimensional Si photonic crystal waveguides having a partial slot resonator are investigated for biosensing. The thickness of sensing layer for antigen-antibody reactions is found to be one of the critical parameters for the high sensitivity.
We show a design of a single layer cross stripes HCG with polarization-independent broadband reflectivity at 1.55 μm and also fabrication of the HCG on silicon-on-insulator (SOI), which demonstrates the polarization-independent reflectivity as designed.
This paper is intended to demonstrate that graphene oxide (GO) on Au films based surface plasmon resonance technique for protein kinetic analysis. The results show that the detection limits of GO sheets were dramatically improved.
Decoherence, often caused by unavoidable coupling with the environment, leads to degradation of quantum coherence. For a multipartite quantum system, decoherence leads to degradation of entanglement and, in certain cases, entanglement sudden death. Tackling decoherence, thus, is a critical issue faced in quantum information, as entanglement is a vital resource for many quantum information applications...
We report the experimental demonstration of the Young's double-slit type spatial quantum interference of the three-photon N00N state, showing three times denser non-classical spatial interference fringes than that of the singlephoton state.
This paper presents Bread Board Model (BBM) of homodyne BPSK (Binary Phase Shift Keying) receiver with an optical phase locked loop and a Doppler shifts compensator for inter-satellite optical communication link. 7.2Gbps BPSK data has been demodulated with sensitivity of −43dBm at bit error rate of 1e-6 under initial frequency offset of +/−7.5 GHz simulated as Doppler shifts due to relative motion...
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