Share Email Print
cover

Proceedings Paper

Low detection limit sensor based on subwavelength grating racetrack resonator
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Subwavelength grating (SWG) ring resonators have demonstrated better sensitivity compared to the conventional silicon strip ring resonators due to the enhanced photon-analyte interaction. As the sensors are usually used in absorptive ambient environment, it is extreme challenging to further improve the sensitivity of the SWG ring resonator without deteriorating the quality factor because the coupling strength between the bus waveguide and the circular ring resonator is not sufficient to compensate the loss. To explore the full potential of the SWG ring resonator, we experimentally demonstrate a silicon-based high quality factor and low detection limit transverse magnetic (TM) mode SWG racetrack resonator around 1550 nm. A quality factor of 9800 is achieved in aqueous environment when the coupling length and gap are equal to 6.5 μm and 140 nm, respectively. The bulk sensitivity (S) is ~429.7 nm/RIU (refractive index per unit), and the intrinsic detection limit (iDL) is 3.71×10-4 RIU reduced by 32.5% compared to the best value reported for SWG microring sensors.

Paper Details

Date Published: 22 February 2017
PDF: 7 pages
Proc. SPIE 10077, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIV, 100770M (22 February 2017); doi: 10.1117/12.2252429
Show Author Affiliations
Lijun Huang, The Univ. of Texas at Austin (United States)
Beijing Univ. of Posts and Telecommunications (China)
Hai Yan, The Univ. of Texas at Austin (United States)
Xiaochuan Xu, Omega Optics, Inc. (United States)
Swapnajit Chakravarty, Omega Optics, Inc. (United States)
Naimei Tang, Omega Optics, Inc. (United States)
Huiping Tian, Beijing Univ. of Posts and Telecommunications (China)
Ray T. Chen, The Univ. of Texas at Austin (United States)
Omega Optics, Inc. (United States)


Published in SPIE Proceedings Vol. 10077:
Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIV
Alexander N. Cartwright; Dan V. Nicolau; Dror Fixler, Editor(s)

© SPIE. Terms of Use
Back to Top