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Scattering near-field microscopy with heated tips is used to spectroscopically characterize the spatially and spectrally distinct infrared thermal near-field demonstrating for the first time the resonant enhancement of the underlying electromagnetic local density of states.
We reference high-precision spectroscopy on atomic hydrogen measured with an uncertainty of 4×10−15 to a remote Cs-fountain clock using a 920 km actively noise-compensated fiber link.
We present the realization of high-Q (Q=36,000) polymeric photonic crystal nanobeam cavities made of two polymers that have an ultra-low index contrast (ratio=1.15), and demonstrate that these polymer cavities are outstanding refractive index sensors (FOM=9190).
We present a high resolution atom interferometer gyroscope based on stimulated Raman transitions of neutral atoms. Employing three separate interaction zones allows to enlarge the signal while maintaining high compactness.
We designed a hollow-core mode-gap cavity in three-layer photonic crystals with Q of 77,000 and 67% air energy concentration ratio. The 3D photonic confinement is achieved through in-plane PBG guiding and vertical total internal reflection.
We propose a device architecture for an in-plane network of optically connected quantum dots. At each node of the network, the dot resides at the intersection of two orthogonal waveguides which transmit the full polarization of an emitted photon to another node. A prototype device is presented.
We demonstrate that the eigenmodes of a waveguide array with disorder in the coupling between adjacent guides are pairwise conjugated. Therefore, self-imaging via phase-segmentation is inherently insensitive to such an off-diagonal disorder.
We report on the nonlinear response and optical bistability in the transmitted and reflected signals of Si3N4 microrings. Micro-second temporal dynamics of the response suggest that the nonlinear behavior is due to the thermo-optic effect.
Continuously tunable slow and fast light is achieved by using a tilted fiber Bragg grating written in an erbium/ytterbium co-doped fiber. By pumping the grating, a tunable time-delay from −38 to 18 ps is achieved.
We demonstrate random lasing emission in a AlGaAs suspended membrane randomly perforated with subwavelength circular holes. Spectrally-resolved imaging of the lasing emission allows identifying lasing modes in the diffusive regime.
We describe a photonic crystal nanocavity with multiple spatially overlapping resonances that can serve as a platform for nonlinear frequency conversion. We show nonlinear characterization of structures with two resonances nearly degenerate in frequency. We also demonstrate structures with resonances separated by up to 592 nm.
The nonlinearity of a SOI ring resonator was measured using a two-tone method. At frequencies near 10 MHz, 1.5 mW causes significant signal degradation. At frequencies near 1 GHz, little signal degradation is seen.
In this work we present an integrated all-optical 4-input NOR logic gate fabricated on InP technology and comprising a fabricated SOA operating at 25 Gb/s and a wavelength demultiplexer. This logic gate may be the base for the development of 4-input look-up tables, needed for the development of larger-scale all optical programmable devices.
A two-color pump beam (401 and 481 nm) was used for molecular phase modulation of hydrogen to enhance stimulated Raman scattering for efficient frequency conversion into the entire visible/ultraviolet region.
Replacing oxygen with sulfur in a squaraine bridge compound leads to a large increase in triplet yield (and triplet-state absorption) while maintaining the already enhanced two-photon absorption as well as the singlet excited-state absorption.
Cascaded quadratic soliton compression in PPLN is investigated and a general critical soliton number is found as the compression boundary. An optimal-parameter diagram for compression at 1550 nm is presented.
We demonstrate the design, fabrication, transmission and nearfield characterization of a novel parabolic tapered 1D photonic crystal cavity in silicon. The design allows repeatable device fabrication, high quality factor and small modal volume.
Nonlinear absorption and refraction coefficients of nanoporous silicon are reported and found to be enhanced compared to those of crystalline silicon. A pump-probe measurement showing the temporal character of the nonlinearity is also presented.
We report a UV laser at 390 nm with frequency modulation tunable between 0.25 and 1.5 THz. The laser generates 10 μJ/pulse in a ∼300 ps width, corresponding to a peak power of 33 kW.
Optical vortices have been observed in a wide variety of optical systems. They can be observed directly in the wavefront of optical beams, or in the correlations between pairs of entangled photons. We present a novel optical vortex which appears in a non-local plane of the two-photon phase space, composed of a single degree of freedom of each photon of an entangled pair. The preparation of this vortex...
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