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Low-loss planar and channel waveguides in ${\rm Pr}^{3+}$ -doped yttrium orthosilicate single crystals were fabricated using 6-MeV oxygen ion implantation. The fabricated surface guiding structure was characterized by the prism coupling method. The relationship between the implantation induced index change and the implantation fluence has been investigated. The photoluminescence properties of the...
High-Q performance in microcavities relies upon use of low absorption dielectrics and creation of smooth dielectric interfaces. For chip-compatible devices, silica has the lowest intrinsic material loss [1]. Microtoroid resonators combine this low material loss with a reflow technique in which surface tension is used to smooth lithographic and etch-related blemishes [2]. At the same time, reflow smoothing...
We propose a variational approach to design adiabatic waveguide connections with minimal intermodal coupling. A design of the “S-bend” of whispering-gallery spiral waveguides is demonstrated with approximately 0.05 dB insertion loss.
A monolithic, 27-meter long waveguide having optical loss of less than 0.1dB/m is demonstrated. The same process produces resonators having Q factors as high as 875 million. Applications are reviewed.
Using a wet etch process, 27 meter long waveguides having optical loss of less than 0.1dB/m are demonstrated. Resonator measurements show that this loss value can be reduced to 0.037 dB/m
We report a waveguide gap structure for nonlinear coupling, written in chalcognide glass with an ultrafast laser. The coupling efficiency between two waveguides is enhanced by the self focusing of shorter and stronger input pulse.
We report embedded waveguide fabrication in Gallium Lanthanum Sulphide glasses using an ultrafast laser. The influence of pulse-width on the waveguide formation was studied and compared using 240-fs and 2-ps pulses, respectively.
We present design and simulation results of a novel nanomechanical sensor using a silicon cantilever comprising two-dimensional (2-D) photonic crystal (PC) microcavity resonator structure. A U-shaped silicon line defect in a 2-D photonic crystal is considered as a waveguide for confining light propagation within waveguide, while two-hole pairs are placed along this silicon waveguide as a optical reflector...
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