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We fabricate horizontal slot waveguides and resonators using layers of polycrystalline and single crystalline silicon. We demonstrate waveguide propagation losses of 7.3 dB/cm and ring resonators with an intrinsic quality factor of 76,000.
Quasi-TM-mode propagation loss of 1.83 dB/cm at lambda = 1.565 mum is achieved in horizontal Si(amorphous)-SiO2-Si(crystalline) slot waveguides with 8.3 nm slots fabricated on silicon-on-insulator. Waveguide loss is measured using a ring resonator with Q ~ 3x105.
We show cascaded silicon microring resonators with 1.5-mum radius critically coupled to a narrower waveguide. A coupled Q of 9,000 is achieved. Devices are fabricated with the widely-available SEM-based lithography system using a stitching-free design.
A compact polarization splitter and rotator based on silicon photonic wire waveguide have been developed. The splitter is based on simple directional couplers. In the fabricated splitter, the polarization extinction ratio is 23 dB and excess loss is less than 0.5 dB. The rotator consists of a silicon waveguide and an off-axis silicon oxinitride waveguide. In the fabricated rotator, efficient polarization...
We report the first observation of Anderson light localization in compact silicon nanophotonic slow-light waveguides consisting of long sequences of coupled resonators fabricated on a silicon-on-insulator (SOI) chip.
We propose the combination of a planar optical resonator and a solid immersion lens for resonantly enhanced non-contact near-field lithography. Subwavelength small spots can be produced by exciting the Bessel modes of the resonator.
We present a novel high-Q resonator using high contrast subwavelength grating. The simulated Q-factor of the resonator can be as high as ~500,000. A Q-factor of 14,000 is experimentally measured in fabricated devices.
A GaAs/AlGaAs-based photonic-crystal device with MEMS activated insertion/removal of defect posts into/from sub-micron photonic-crystal holes has been fabricated and investigated. This allows the device to actively create/remove point resonators or waveguides in the photonic-crystal membrane.
We report on the fabrication and investigation of pyramidal GaAs micro-cavities on top of a Bragg mirror. A finite-difference time-domain simulation supports the experimentally found optical mode structure for such a cavity shape.
We demonstrate a robust double-capillary microfluidic ring resonator optical sensor imbedded into a solid polymer matrix. The device is capable of compensating the temperature and pressure variations and can be generalized to a multi-capillary lab-on-a-chip.
An expression for the quantum-limited frequency resolution of active waveguide ring resonator spectrometers is derived, and a 1.6 cm diameter, diode-pumped, active waveguide, ring resonator is demonstrated in a neodymium-doped glass with finesse of 250.
We fabricate planar magnetic photonic metamaterials via direct laser writing and silver chemical vapor deposition, an approach, which is also suitable for three-dimensional structures. Retrieval of the effective metamaterial parameters reveals the importance of bi-anisotropy.
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