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We report on the large Kerr induced wavelength shift observed in our hydrogenated amorphous silicon microresonators and demonstrate their use for all-optical modulation and switching on picosecond time scales with only subpicojoule pulse energies.
We experimentally demonstrate avalanche sub bandgap detection of light at 1550 nm wavelength via surface states using the configuration of interleaved PN junctions along a silicon waveguide. The device operates in a fully depleted mode.
Monolayer graphene sheet has been integrated on top of small disk optical resonator in SOI platform. Electro-optic interaction between graphene and whispering gallery mode of the cavity has been demonstrated and studied for modulation application.
We developed an adhesive bonding process to integrate silicon nanomembranes onto silicon chips. A grating-coupled 1-to-32 H-tree optical distribution is experimentally demonstrated with an excess loss of 2.2 dB and a uniformity of 0.72 dB.
A drastic Q factor variation from 7900 to 1200 is observed in a silicon ring resonator loaded by micrometer-scale graphene with various lengths. The significant decay of the Q factor agrees with a numerical analysis.
We demonstrate an ultralow-power, low-dispersion and compact silicon-organic-hybrid photonic crystal waveguide modulator. RF power consumption of 1.5nW, effective in-device r33 of 1190pm/V and Vπ×L of 0.291±0.006V×mm over 8nm optical bandwidth are demonstrated.
25 Gbps operation was obtained with extinction ratios of 2 – 4 dB for Vpp = 1.00 – 1.75 V in MZI modulator consisting of 200-µm photonic crystal slow light waveguide phase shifters.
Thin film Ge1−xSnx photodetectors fabricated on Si using a CMOS compatible process had responsivities at 1.55 µm of 6.59, 1.49, 2.63, and 0.84 mA/W for 0.9, 2.57, 3.2, and 7.0 % Sn. Spectral response for a Ge0.93Sn0.07 photodetector had extended infrared response out to 2.2 µm.
A new type of “black silicon” materials with high optical absorptance and annealing-insensitivity is designed and fabricated by femtosecond laser pulses. These results have important implications for the fabrication of highly efficient optoelectronic devices.
We demonstrate a 2D grating emitter that emits circularly polarized light beam synthesized from a waveguide mode. A micro-heater is integrated to control handedness of the circularly polarized light. The device shows emission efficiency of about 8%, while simulations predict much higher efficiency of 72% with ideal conditions. Such a device could serve as an interface between silicon photonic waveguides...
We propose a polarization splitting method based on near-field interference. Unlike conventional polarizers, our design does not absorb the undesired polarization but rather deflects light in a polarization-dependent manner. This could enable high efficiency polarization-resolved-imaging.
Single-pulse (532 nm, 10 ns) micropatterning of silicon surfaces through a pinhole is demonstrated using scanning electron and atomic force microscopy. The results are compared to the Fresnel diffraction theory and physical mechanisms are discussed.
We report a terahertz waveguide fabricated from doped crystalline silicon. Anisotropic chemically etching is used to produce a periodic array of concave pyramidal troughs in the silicon that provide confinement in both transverse directions.
We identify a hybrid plasmonic slot waveguide capable of millimetre range transport and deep subwavelength nanofocusing by varying slot width. Convenient integration with the SOI platform provides an important bridge between plasmonics and silicon photonics.
Here we numerically investigate Brillouin scattering (BS) in a silicon slot waveguide. We show that BS is strongly influenced by the boundary effects, instead of the usual photo-elastic effect leading to the interaction with distinct mechanical modes.
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.
We study a metamaterial-based optical waveguide formed by a silica-filled slot in a layered metal-dielectric slab. This geometry results in very strong confinement of a quasi-TE fundamental mode and gives smaller propagation losses than a purely metallic slot waveguide.
We observe experimentally a transition of quality factor scaling from third power to fifth power of the number of periods in periodic silicon optical waveguides designed to exhibit a degenerate band edge.
We report the wavelength dependency of third-order nonlinearity and multi-photon absorption of silicon in the spectral range from 1.6 µm to 6 µm, including the nonlinear figure of merit [1].
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