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Erbium doped chalcogenide films were fabricated by cothermal evaporation and demonstrated propagation losses and lifetimes suitable for waveguide amplifiers. The 1490nm pumped Photoluminescence yield is up to ∼10x higher than the prior best film material, Er:TeO2.
A piezoelectric aluminum nitride film on oxidized silicon wafer is used to realize high frequency surface acoustic wave devices. Optical ring resonator is integrated with the surface acoustic wave device to demonstrate a high speed acousto-optic modulation.
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.
Opto-mechanically controlled liquid crystalline elastomer (LCE) integrated tunable polymeric microgoblet lasers are fabricated on a silicon chip. Symmetrical deformation of uniaxially aligned LCE microcylinders enables expansion of the microgoblet resonators for tuning the lasing 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.
New results on integration of colloidal quantum dots (QDs) into SiN microstructures are reported, including QD positioning with nanometric accuracy and the efficient coupling of their emission to waveguides and cavities. The results are relevant to on-chip quantum optics and information processing.
We report an interferometer consisting of two spatially separated balanced Mach-Zehnder interferometers sharing a polarization entangled source. Nonlocal correlation statistics enable entanglement detection, Bell state identification, and fidelity bounding.
Near-infrared epsilon-near-zero metamaterial slabs based on Ag-Ge multilayers are experimentally demonstrated and numerically analyzed. A post-annealing process and multilayer grating structures are introduced to reduce the optical loss and also tune the epsilon-near-zero wavelength.
Highly efficient single-photon collection from solid-state single-photon emitters is an important task in quantum optics. Here, we will introduce two approaches based on three-dimensional laser-written microstructures to enhance collection efficiency as well as directivity.
We present a 10-channel slotted single-mode laser array with effective-cavity-length ∼300µm which exhibits quasi-continuous tuning range ∼31nm over 42°C with side-mode suppression-ratio >35dB. The linewidth is about 2MHz for all channels at 150mA at 20°C.
This paper studies relation between high-frequency chirping of a quantum-cascade laser and the curvature of its light-current characteristic. Assuming negligible thermal backfilling and a photon lifetime of 9ps, a gain-compression effect explains both experimental observations.
We combine the fast guided-mode expansion with a genetic algorithm to perform a global optimization of several widely used photonic crystal cavity designs. The procedure consistently improves their quality factor by more than one order of magnitude, and is in addition highly customizable.
We designed scalable all-optical logic gates that operate at the same input and output wavelength based on microrings. We investigated the influence of input power fluctuations and fabrication errors.
We propose a novel and ultrasensitive scheme of rotation sensing by measuring farfield intensity from an asymmetric microcavity laser. We optimize the cavity shape and show the farfield sensitivity is enhanced by introducing structural chirality.
We propose and show experimentally uniform axisymmetric spatial filtering of light beams by three-dimensional axisymmetric photonic microstructures. Such gapless structures (similar to photonic crystals) were recorded in bulk of glass. Angular filtering of 25 mrad is demonstrated experimentally.
We present an Er-doped fiber femtosecond laser having a wider repetition rate tuning range by introducing a pair of CFBGs which magnifies the cavity length change by 15 times.
We present a proof-of-principle of broadband, non-collinear quasi-phase-matching in a hybrid OPCPA system. It employs a combination of quasi-phase-matching and group-velocity-matching in a MgO:PPLN delivering 3.4-µm, 17.2-µJ, 43.1-fs pulses at 50 kHz repetition-rate.
We have obtained record gain of 60 dB with a continuous-wave two-pump fiber optical parametric amplifier, over a 5.5-nm bandwidth. We used a 500-m long fiber, and 1.5 W of pump power.
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