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We propose a technique for sub-diffractional focusing in the far field of optical elements. The method combines subwavelength analogs of Fresnel lenses and planar anisotropic metamaterials, used to generate and propagate sub-diffractional information, respectively.
We design a photonic crystal hetero-slab-edge microcavity sustaining surface mode with high quality factor ~5.4 times 105 and index sensitivity of 591 nm/refractive index unit by mode-gap effect. Lasing actions from real devices are also observed.
We demonstrate a new type of optical coherence tomography using only classical resources to achieve results that are typically associated with quantum-enhanced metrology: factor-of-two axial resolution enhancement and even-order dispersion cancellation.
We propose and analyze a parallel-coupled dual racetrack-ring silicon modulator. Our simulations show that a wide variety of advanced modulation formats such as QPSK and 16-QAM can be achieved in such a structure.
We present a mid-infrared frequency comb based on a synchronously-pumped, femtosecond optical parametric oscillator. The idler (signal) is continuously tunable from 2.8-4.8 mum (1.76-1.37 mum) with a maximum average output power of 1.50 W.
We theoretically investigate light localization and local density of states manipulation in aperiodic photonic structures and discuss their applications as pseudo-random lasers and label-free optical biosensors.
Imaging of vapor-phase H2O2 concentrations is performed using photofragmentation LIF. An Nd:YAG-laser is used for photolysis and a dye laser for LIF on OH generated in the photolysis process. Detection limit is ~30 ppm.
Using classical estimation techniques, we design homodyne phase-locked loops for optical temporal phase and instantaneous frequency measurements at the quantum limit.
Using analytical and numerical methods, we analyze the temporal response of optical nanocircuit boards formed by grooves in epsilon-near-zero (ENZ) metamaterial substrates. We discuss bandwidth, group velocity and signal delay in such ENZ-surrounded channels.
Femtosecond-laser-written optical waveguides are integrated into a commercial capillary electrophoresis chip. A fluorescence detection scheme is implemented, resulting in a compact device. Testing is performed by electrophoresis and detection of a 1-nM oligonucleotide plug.
We experimentally demonstrate a nanoplasmonic analog of electromagnetically induced transparency utilizing a stacked optical metamaterial. Specifically, we achieve a very narrow transparency window with high modulation depth due to nearly complete suppression of radiative losses.
We present a monolithically integrated near-infrared fluorescence sensor incorporating a dielectric emission filter for in vivo applications. We successfully integrated a dielectric emission filter (OD3) onto a low-noise detector and sensed 50 nM fluorescent dye concentration.
Effective sensing with photonic crystal cavities requires optimization of modal quality factor and field overlap. For several unrelated cavities, we find the quality factor dominates, so that dielectric modes are strongly favored over air modes.
By exploiting optical parametric generation in periodically poled lithium niobate driven by a Yb:KYW laser, we realized a two-colour pump-probe system in the near- and mid-infrared with 1-MHz repetition rate, 300-fs resolution and 10-5 sensitivity.
Femtosecond-laser-written waveguides were integrated with fluidic microchannels in a commercial lab-on-a-chip. High-spatial-resolution monitoring of fluorescently labeled DNA molecules during capillary electrophoresis separation is demonstrated, as an intermediate step toward point-of-care diagnostic bioassays for DNA analysis.
We conceive and build a compact cold atom interferometer with an original architecture based on integrated optical components. These new inertial sensors can play a significant role in navigation, fundamental physics and earth observation.
We experimentally demonstrate that a single nanoparticle can induce mode splitting of MHz in an ultra-high-Q microtoroid resonator, which can be used to extract information of the nanoparticle. Analytical model matches well with the experiments.
A new design mitigates multimode waveguide behavior in an optofluidic platform and increases fundamental mode coupling to 95%. Experimental results yield excellent agreement with simulations and demonstrate a suitable device for optical particle manipulation.
A new method for precise frequency measurement of continuous-wave terahertz (THz) wave is proposed by using a THz frequency comb of photocurrent in a photoconductive antenna for THz detection. Effectiveness of the proposed method is demonstrated by measurement of a test source. Precision of the frequency measurement was 2.2times10-11 within the range of 75-110 GHz.
Rapidly responding, high-sensitivity terahertz (THz)-wave detection with an organic DAST crystal was demonstrated using nonlinear frequency up-conversion to near-infrared light. Detection of THz-wave signals from 16.4-THz to 26.3-THz was achieved at room temperature.
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