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Recently developed subwavelength structures in silicon waveguides are presented. Subwavelength grating photonic structures are discussed along with emerging practical components that exploit the principle of subwavelength refractive index engineering, including polarization-independent athermal silicon waveguides, ultra-broadband and compact multimode interference couplers, fabrication tolerant polarization...
We demonstrate a silicon diffractive element that serves as an optical tweezer in the near infrared and as a fluorescence collector in the visible. The 1.3 NA lens is achromatic and has high diffraction efficiency.
Thermo-optical compensation in high-index contrast waveguide system (a-Si on SiO2) is reported using different cladding materials. We experimentally demonstrate the thermo-optically compensated a-Si based racetrack ring resonators with an acrylate polymer cladding.
We present generalized design rules for athermal performance and materials compatibility in high-index-contrast (HIC) waveguides. Thermal stability of integrated photonic devices is one critical limitation in the development of commercially viable integrated optoelectronic circuits. Thermooptically neutral designs are achieved by choosing a cladding material whose thermooptic coefficient is opposite...
Novel Zero-order arrayed waveguide grating (AWG) based polarization splitters in the silicon-on-insulator platform are reported and experimentally demonstrated. These passive devices employ the cladding-induced stress for achieving the polarization splitting function.
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