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Integrated chip-scale electrodes allow isolated control of resonances and phases in optical multi-cavity system. By varying the round trip length, destructive and constructive intra-cavity interferences are observed, representing all-optical analogue to electromagnetically-induced-transparency and superradiance on-chip.
We present frequency tunable metamaterials at terahertz frequencies using broadside-coupled split ring resonators. Frequency tuning, arising from changes in near field coupling, is obtained by in-plane displacement between the SRR layers. A maximum frequency shift occurs for displacement of half a unit cell resulting in a shift of 663 GHz (51% of f0).
A theoretical analysis of gain and noise in a long-range surface plasmon-polariton amplifier is presented. The amplifier structure considered consists of a thin gold film on silica incorporating an index matched gain medium in the form of LDS821 dye molecules in solution.
We show numerically a significant depletion of the density of optical states in disordered three-dimensional network structures. The pseudo photonic band gap is likely produced by short-range order and uniformity of local topology.
We show how to enhance, reduce, and completely suppress the acceleration of Airy beams in graded-index media. By engineering the refractive-index gradient, active bending control of the Airy beams is realized, relevant to various environments.
Femtosecond laser writing of cascaded Mach-Zehnder interferometers were optimized in fused silica to form flat-top interleavers with 0.5-dB bandwidth of 10 nm and 15 dB extinction ratio that opens new directions in wavelength division multiplexing.
We describe an angular selective photovoltaic window, designed to transmit normally incident light and absorb off-angle light by exploiting an anisotropic plasmonic nanostructure. The principles of operation and numerical simulation results are presented.
Interferometrically read-out micro tuning forks are used as small bandwidth acoustic wave detector in photoacoustic spectroscopy. A comparison to the piezoelectrically read-out QEPAS technique and a miniaturized future PAS sensor design is presented.
A model for a resonant optothermoacoustic sensor is validated by comparison with experiments performed with 0.5% acetylene in nitrogen. At low concentrations, the molecular dynamics of the trace gas do not influence the signal.
Mixed gas sensing based on a broad-band super-luminescent diode (1535 nm) coupled with an external Fabry-Perot etalon is proposed. The wavelength tuning by tilting the etalon will provide selective gas sensing by absorption spectroscopy technique.
High-finesse external cavity was passively locked simultaneously at wavelengths of 1.064μm laser diode and 0.532μm with a waveguide PPLN crystal. Cavity enhanced spectroscopy was demonstrated to detect trace NO2 employing the cavity.
Employing an external cavity QCL and using OA-ICOS and multiple line integrated absorption spectroscopy techniques, we report an effective sensitivity of detection of ∼28 ppt for NO2 in Zero-Air.
Diamond color centers show promise in quantum photonics applications. However practical implementation is limited by low photon collection efficiency. We report precise fabrication of structures which substantially increase collection efficiency from color centers.
We propose a scheme to experimentally investigate cross-talk in closely positioned QD photodetectors. A cross-talk of ∼25.8% at separation of 212 nm is demonstrated in pre-optimized devices.
We demonstrate, for the first time, molecular contrast imaging in deep tissue by successfully combining chemically-selective, stimulated Raman photoexcitation with high-frequency ultrasound detection.
Ultrafast laser inscription has been used to produce an optical waveguide evanescent field sensor. Fabricated in a single step and exhibiting an insertion loss of 2.6 dB, the device had a visibility of 3.7 dB.
We realize vibrational photoacoustic microscopy (VPA) using molecular excitation of overtone vibration and acoustic detection of the resultant pressure transients. We demonstrate 3-D VPA imaging of lipid-rich atherosclerotic plaques and lipid bodies in living Drosophila larvae by exciting 2nd overtone of the CH bond stretch around 8300 cm−1. Depth-resolved spectral analysis and a penetration depth...
We have developed a robust, BB84, 850 nm wavelength, gigahertz clock, phase encoding quantum key distribution system. This has been analyzed using a number of single-photon detectors and tested against predictions from our theoretical model.
We have developed a high-power narrow linewidth Raman amplifier near 1.27 micron and integrated it into an Integrated Path Differential Absorption lidar. Ground-based measurements of atmospheric oxygen have been performed using the integrated amplifier.
The signal-to-noise ratios have been derived for IPDA lidar using a direct detection receiver for both pulsed and sinewave laser modulation techniques, and the results and laboratory measurements are presented.
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