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Cavities have become a very important tool for scientific research and for industrial applications like lasers and detectors because of the outstanding ability of field enhancement that increases the light-matter interaction. Therefore a goal ever since was to increase the field enhancement by improving the mirrors of optical cavities. This research leaded to very good mirrors with a mirror loss of...
Based on the concept of spin rotation coupling, we propose and realize a novel nonlinear metasurface with homogeneous linear optical properties but continuously controllable phase of the local effective nonlinear polarizability. The continuous phase control over the nonlinearity is experimentally demonstrated for second and third harmonic generations by using nonlinear metasurfaces consisting of nanoantennas...
Nonlinear metasurfaces based on coupling locally-enhanced plasmonic response to intersubband transitions of multi-quantum-wells have recently provided second-order susceptibilities several orders of magnitude larger than any other non-linear flat structure measured so far. Here, we demonstrate that a proper design of the plasmonic metasurface inclusions can dramatically enhance the overall non-linear...
Due to their strong modal confinement, optical microfibres (OMs) provide an excellent opportunity for studying nonlinear effects and in particular intermodally phase matched second (SHG) and third (THG) harmonic generation [1-3] with predicted efficiencies up to 10−1 over several cm in an ideal uniform silica OM for both cases. Experimentally however, fabricating the required phase matching diameter...
Several nonlinear-optical coupling schemes in double domain positive/negative index metamaterials are proposed, which include ordinary and backward electromagnetic waves. One of them is investigated in the context of the applications to compensating strong losses inherent to plasmonic metamaterials and to design of novel ultracompact photonic devices for optical sensing and data processing. Each of...
Second- and third-harmonic generation in silicon photonic crystal nanocavities using a low-power, continuous wave laser at telecommunication wavelengths is demonstrated. This is achieved by employing cavities that are optimized for high quality factor and efficient coupling to the incoming beam in the far field.
We show visible frequency conversion by simultaneous second- and third-harmonic generation in a silicon photonic crystal nanocavity optimized for efficient far-field in-coupling of a low-power continuous-wave optical excitation at 1.5 microns.
We theoretically demonstrate high fidelity frequency conversion of a photon generated by a dipole-like emitter in a double mode nonlinear cavity irradiated by a classical field, and propose a realistic photonic crystal nanocavity implementation.
We designed a single-pass quasi-phase-matched second-harmonic generation (SHG) device with a planar waveguide; the device comprised a Y-cut 5 mol% MgO-doped LiNbO3 (MgO:LiNbO3) crystal core that was 3 mum thick and SiO2 cladding. The waveguide provided a high coupling efficiency of 95% between an incident Gaussian beam and the fundamental guided mode of a fundamental wave; it also provided high electric-field...
Several techniques for amplitude modulation and apodization of QPM interactions are proposed and demonstrated. Using these techniques, tuning curve side-lobes are suppressed 13-17 dB compared to that of a uniform grating.
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