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We use plasmonic antenna arrays to unidirectionally couple incident light in two different polarization states to long-range surface plasmon polariton waveguide modes propagating in opposite directions. The structures enable polarization-sorting with extinction rates in excess of 30dB.
A novel athermal scheme based on resonance splitting of dual-ring structure is proposed and proved. An athermal resonator based on this scheme is demonstrated, achieving athermal transmission over a temperature range of at least 40K.
We present a polarization rotator and coupler that rotates the TE0 mode in a silicon waveguide and couples to the hybrid plasmonic (HP0) mode. Coupling factor of ∼ 60% and polarization conversion efficiency of ∼ 90% is achieved.
Increasing coupling of terahertz radiation into a low dispersion, broadband two-wire waveguide is an important issue to address. To resolve this, we demonstrate an active two-wire waveguide with higher performance compared to its passive counterpart.
We designed and fabricated silicon nitride micordisk-waveguide vertical coupling devices processed at a low temperature of 270°. We experimentally demonstrate an intrinsic quality factor of 7.2×104 in the disk with only 15µm radius operating near 1310nm.
We demonstrate theoretically and experimentally the Rashba effect using light in two “counterpropagating” photonic lattices. We observe breaking of inversion symmetry in the resulting band structure.
We demonstrate, for the first time, the controlled coupling of rolled-up microtubes integrated with silicon waveguides by thermally tuning the coupling gap. Then we realize coupling modulation utilizing the dynamic tuning effect.
A wide-bandwidth, highly efficient method of inter-chip waveguide coupling suitable for on-chip, mid-infrared sensing is discussed. Simulations and preliminary fabrication work on laser-to-waveguide coupling are presented, with losses predicted to be better than 6 dB.
A compact hybrid plasmonic 50∶50 directional coupler for the next generation of silicon photonics integrated circuit was fabricated and measured. Our device has a very small footprint of 21.2 µm by 1.1 µm. The coupler has less than 10% variation from a 3 dB coupling ratio over a wavelength range of more than 100 nm around 1.55 µm and an insertion loss of less than 1dB.
We demonstrate all-optical control of terahertz wave mode coupling in a silicon-filled parallel-plate waveguide. The resulting frequency modulation is widely tunable by moving the control beam illumination in the propagation direction.
We observed the phase transition of multiple superradiant states in chaotic optical cavities with multiple open decay channels base on photonic crystals.
We report simulation, fabrication and, for the first time, full amplitude-phase near-field optical characterization in telecom range of the compact and efficient plasmonic nanoantenna based couplers. Near-field data allowed characterizing the subwavelength slot waveguide's propagation losses and effective mode index that correspond well to the simulated ones.
We show the importance of polarization and phase engineering when designing quantum information devices. Using the example of a photonic-crystal waveguide we demonstrate, for the first time, designs for an integrated quantum dot spin-photon interface.
We present a polarization beam splitter with a metal nanorods array embedded between two silicon waveguides. Localized surface plasmon resonance of the metal array introduces the birefringence with short coupling length and broad bandwidth.
We demonstrate methods to identify the modal composition of light guided through integrated multimode waveguides and discuss a scheme how arbitrary higher-order modes can selectively be excited. Exemplary, we show efficient and broadband polarization conversion.
We investigate polarization cross-coupling between modes of microring resonators and waveguides due to structural asymmetries. We experimentally demonstrate the coupling between a double-layer SOI waveguide fundamental TM mode and microring higher-order radial TE modes.
We demonstrate microring resonators with full tunability, modulation bandwidths exceeding the linewidth limit, and improved tolerance to wafer-scale variations. Novel device architectures and designs enable microrings to become more practical for integrated photonics.
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