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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.
A novel ultra-broad bandwidth ultrasound detector is demonstrated using imprinted polymer microring, with flat frequency response up to ∼350 MHz at −3dB. A record high sub-3µm axial resolution in ultrasound/photoacoustic imaging applications is demonstrated.
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.
The optical low-coherence interferometry built with an optical ruler was proposed to demonstrate silicon-wire transverse-magnetic polarized indices of refraction and birefringence as 2.02 and 0.64, respectively, from the microring resonator effective length using various interferograms.
Single pass gain of 77mm crystal and ceramic Yb:YAG disks are compared in the 100–200K temperature range. Experiments are performed on a laser amplifier cooled through a static low pressure helium gas cell.
We demonstrate high gain producing 60 mJ, 200 ps pulses at 200 Hz from a single 4-mm ASE limited gain-cell. A scaling paradigm utilizing a monolithic array of gain cells is proposed.
We report photonic radio-frequency arbitrary waveform generation in the W-band, enabled through optical pulse shaping and a near-ballistic uni-traveling-carrier photodiode. Example waveforms spanning 75–110GHz with long time apertures are generated and measured after wireless propagation.
We report a technique to simultaneously optimize the peak rejection and the resolution of a radiofrequency photonic notch filter based on a silicon nitride ring resonator.
We demonstrate the coherent combination of two solid-core fibers, which are used for nonlinear spectral broadening followed by temporal recompression. 320 fs input pulses coming from a fiber CPA system are split up and independently broadened in the two spatially separated fibers, hence, limitations of individual fibers are lifted. After recombination and compression, sub-30fs pulses were achieved...
We present the first experimental realization of optical supersymmetry and demonstrate mode conversion and global phase-matching between SUSY partner structures. Our results may pave the way for compact and highly efficient integrated mode-division-multiplexing schemes.
We report optical trapping of 60 nm Au nanoparticles using photonic crystal slot-cavities with Q's of ∼7200 and 0.3mW of guided power at 1.6µm. Histograms of the cavity transmission are used to quantitatively analyze the trapping dynamics by modeling the back-action of the nanoparticles in the trap.
We report a high-temperature flow sensing technique based on thermally regenerated fiber Bragg gratings in high attenuation fibers. It can provide flow rate measurements up to 800 °C with compensation for ambient temperature variations.
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 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.
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.
A polarization line-by-line pulse shaper is used in analytically measuring optical arbitrary waveforms (OAWs) of 100% duty cycle without reference, which is essential for high repetition rate OAWs.
We demonstrate a broadband Kerr frequency comb and mode-locking in a globally-normal-dispersion microresonator. A record short on-chip pulse of 74-fs is directly measured. Supported by analytical theory and numerical modeling, we describe the mode-locking mechanism.
Combining a multi-color homodyne detection scheme with techniques from quantum optics, we show the feasibility of shot-noise limited measurements of a medium's parameters, while also being able to compensate for their fluctuations.
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