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Proceedings Paper

Towards a fully packaged high-performance RF sensor featuring slotted photonic crystal waveguides
Author(s): Chi-Jui Chung; Harish Subbaraman; Xingyu Zhang; Hai Yan; Jingdong Luo; Alex K.-Y. Jen; Robert L. Nelson; Charles Y.-C. Lee; Ray T. Chen
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Paper Abstract

A low loss and high sensitivity X-band RF sensor based on electro-optic (EO) polymer filled silicon slot photonic crystal waveguides (PCW) and bowtie antenna is proposed. By taking advantage of the slow light enhancementt in the PCW(>20X), large EO coefficient of the EO polymer(r33>200pm/V), as well as significant electric field enhancement of bowtie antenna on silicon dioxide substrate(>10000X), we can realize a large in-device EO coefficient over 1000pm/V so as to realize a high performance RF wave sensor. In addition, on-chip Mach-Zender interferometer (MZI) layout working under push-pull configuration is adopted to further increase the sensitivity of the sensor. Furthermore, inverse taper couplers and slotted photonic crystal waveguides are carefully designed and discussed in this paper to reduce the insertion loss of the device so as to increase the device signal-to-noise ratio. The minimum detectable electromagnetic power density is pushed down to 2.05 mW/m2, corresponding to a minimum sensing electric field of 0.61 V/m. This photonic RF sensor has several important advantages over conventional electronics RF sensors based on electrical scheme including high data throughput, compact in size, and great immunity to electromagnetic interference (EMI).

Paper Details

Date Published: 2 May 2016
PDF: 12 pages
Proc. SPIE 9747, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX, 97471V (2 May 2016); doi: 10.1117/12.2213557
Show Author Affiliations
Chi-Jui Chung, The Univ. of Texas at Austin (United States)
Harish Subbaraman, Omega Optics, Inc. (United States)
Xingyu Zhang, The Univ. of Texas at Austin (United States)
Hai Yan, The Univ. of Texas at Austin (United States)
Jingdong Luo, Univ. of Washington (United States)
Alex K.-Y. Jen, Univ. of Washington (United States)
Robert L. Nelson, Air Force Research Lab. (United States)
Charles Y.-C. Lee, Air Force Research Lab. (United States)
Ray T. Chen, The Univ. of Texas at Austin (United States)
Omega Optics, Inc. (United States)

Published in SPIE Proceedings Vol. 9747:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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