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Photon pair generation in hydrogenated amorphous silicon microring resonators.

ABSTRACT: We generate photon pairs in a-Si:H microrings using a CW pump, and find the Kerr coefficient of a-Si:H to be 3.73?±?0.25?×?10^-17m²/W. By measuring the Q factor with coupled power we find that the loss in the a-Si:H micro-rings scales linearly with power, and therefore cannot originate from two photon absorption. Theoretically comparing a-Si:H and c-Si micro-ring pair sources, we show that the high Kerr coefficient of this sample of a-Si:H is best utilized for microrings with Q factors below 10³, but that for higher Q factor devices the photon pair rate is greatly suppressed due to the first order loss.

SUBMITTER: Hemsley E

PROVIDER: S-EPMC5171649 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Photon pair generation in hydrogenated amorphous silicon microring resonators.

Hemsley Elizabeth E Bonneau Damien D Pelc Jason J Beausoleil Ray R O'Brien Jeremy L JL Thompson Mark G MG

Scientific reports 20161220

We generate photon pairs in a-Si:H microrings using a CW pump, and find the Kerr coefficient of a-Si:H to be 3.73 ± 0.25 × 10<sup>-17</sup>m<sup>2</sup>/W. By measuring the Q factor with coupled power we find that the loss in the a-Si:H micro-rings scales linearly with power, and therefore cannot originate from two photon absorption. Theoretically comparing a-Si:H and c-Si micro-ring pair sources, we show that the high Kerr coefficient of this sample of a-Si:H is best utilized for microrings wit ...[more]

PMID: 27996014

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Project description:The ability to perform multiple simultaneous protein biomarker measurements in complex media with picomolar sensitivity presents a large challenge to disease diagnostics and fundamental biological studies. Silicon photonic microring resonators represent a promising platform for real-time detection of biomolecules on account of their spectral sensitivity toward surface binding events between a target and antibody-modified microrings. For all refractive index-based sensing schemes, the mass of bound analytes, in combination with other factors such as antibody affinity and surface density, contributes to the observed signal and measurement sensitivity. Therefore, proteins that are simultaneously low in abundance and have a lower molecular weight are often challenging to detect. By employing a more massive secondary antibody to amplify the signal arising from the initial binding event, it is possible to improve both the sensitivity and the specificity of protein assays, allowing for quantitative sensing in complex sample matrices. Herein, a sandwich assay is used to detect the 15.5 kDa human cytokine interleukin-2 (IL-2) at concentrations down to 100 pg/mL (6.5 pM) and to quantitate unknown solution concentrations over a dynamic range spanning 2.5 orders of magnitude. This same sandwich assay is then used to monitor the temporal secretion profile of IL-2 from Jurkat T lymphocytes in serum-containing cell culture media in the presence of the entire Jurkat secretome. The same temporal secretion analysis is performed in parallel using a commercial ELISA, revealing similar IL-2 concentration profiles but superior precision for the microring resonator sensing platform. Furthermore, we demonstrate the generality of the sandwich assay methodology on the microring resonator platform for the analysis of any biomolecular target for which two high-affinity antibodies exist by detecting the approximately 8 kDa cytokine interleukin-8 (IL-8) with a limit of detection and dynamic range similar to that of IL-2. This work demonstrates the first application of silicon photonic microring resonators for detecting cellular secretion of cytokines and represents an important advance for the detection of protein biomarkers on an emerging analytical platform.

Dataset Information

Photon pair generation in hydrogenated amorphous silicon microring resonators.

Publications

Photon pair generation in hydrogenated amorphous silicon microring resonators.

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