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Mid infrared silicon photonic integrated components, namely grating couplers, strip and slot waveguides, slotted and un-slotted photonic crystal waveguides, photonic crystal microcavities are experimentally demonstrated in silicon-on-sapphire. Application in trace gas sensing is experimentally demonstrated. Progress towards monolithic integration of lasers and detectors are discussed.
We demonstrate low-voltage Ge waveguide avalanche photodetectors (APDs) with gain-bandwidth product over 100GHz. A 5.8dB avalanche sensitivity improvement (1×10−12 bit error ratio at 10Gb/s) is obtained for the wire-bonded optical receiver at −5.9V APD bias.
We provide the first experimental demonstration of propagation characteristics of holey and slotted two dimensional photonic crystal waveguides in silicon-on-sapphire at mid-infrared wavelength of 3.43 μm.
We experimentally demonstrate the first holey and slotted photonic crystal waveguides in silicon-on-sapphire at mid-infrared wavelength of 3.43μm. Chemical warfare simulant triethylphosphate was detected in gas phase at 10ppm concentration via optical absorbance signature.
Six orders of magnitude wide dynamic range (0.1ng/ml to over 100μg/ml), label-free detection of gentamicin small molecules with silicon photonic crystal microcavity biosensors multiplexed by multimode interference power splitters was experimentally demonstrated. Detection specificity was confirmed.
We demonstrate low-voltage germanium waveguide avalanche photodetectors (APD) with gain-bandwidth product of 88GHz. A 7.1dB sensitivity improvement is demonstrated for an APD wire-bonded to a 10Gb/s CMOS transimpedance amplifier, at −6.2V APD bias.
We present the design, fabrication and characterization of a compact and highly sensitive integrated photonic electromagnetic field sensor based on a silicon-organic hybrid modulator driven by a bowtie antenna. Slow-light effects in the electro-optic (EO) polymer refilled silicon slot photonic crystal waveguide (PCW), together with broadband electric field enhancement provided by the bowtie antenna,...
Typical L-type photonic crystal (PC) microcavities have a dynamic range of approximately 3–4 orders of magnitude in biosensing. We experimentally demonstrated that multiplexing of PC sensors with different geometry can achieve a wide dynamic range covering 6 orders of magnitude with potential for 8 or more orders with suitable optimization.
We compared different on-chip silicon based absorption sensors for the detection of xylene in water in both near-infrared and mid-infrared with detection limit down to 1ppb. Strip waveguide, slot waveguide and PC-based chip integrated optical absorption spectroscopy devices are compared in near-infrared and mid-infrared. The results provide a route for enhanced sensitivity while retaining device miniaturization.
Triethyl phosphate (TEP), a chemical warfare simulant, has absorption peaks in the mid-infrared. Using a single mode slot wave guide we were able to detect TEP, with a detection limit down to 75 ppm. This provides enhanced sensitivity while simultaneously achieving device miniaturization.
We experimentally demonstrate a new type of micro-fluid channel design with crossing optical waveguides that not only block any gaps in the microfluidic channels in one fabrication step but also enable nearly lossless optical propagation in the primary waveguides on a chip. Such designs are critical for all sensing applications where the analyte must be flowed over the sensor.
We experimentally demonstrate simultaneous selective detection of xylene and trichloroethylene using photonic crystal waveguide. Sensitivity is improved by slow light effect of PC to 1ppb (v/v) for xylene and 10ppb (v/v) for TCE in water.
We experimentally demonstrate that in photonic crystal sensors with side-coupled cavity-waveguide, group velocity of propagating mode in the coupled waveguide at the resonant mode frequency enhances sensitivity in addition to microcavity mode engineering.
We experimentally demonstrate a photonic crystal microcavity biosensor with 1pM sensitivity. Radiation loss engineering for high Q and increased mode overlap with analyte are combined to achieve the highest sensitivity in silicon-on-insulator platform.
A photonic crystal slot waveguide based infrared absorption spectroscopy device is demonstrated for the on-chip spectroscopic determination of chemical warfare simulant triethylphosphate.
A approach of using high performance Ge photo-detectors (PD) integrated with Si waveguide based microresonators for multiplexing detection has been proposed. Simultaneous measurement of the resonance curves of sensor array using this approach has been demonstrated. The resonance peaks of integrated sensor array show good correlation (R2=0.9979) with that of normal resonator, proving the feasibility...
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