Ultrahigh <italic>Q</italic> Polymer Microring Resonators for Biosensing Applications

• Main Authors: Xin Tu, Sung-Liang Chen, Chaolong Song, Tianye Huang, L. Jay Guo
• Format: Article
• Language: English
• Published: IEEE 2019-01-01
• Series: IEEE Photonics Journal
• Subjects: Biosensor; ring resonator.
• Online Access: https://ieeexplore.ieee.org/document/8642857/
• ISSN: 1943-0655

The capability of an ultrahigh Q polymer microring resonator as a biosensing system is systematically investigated. By optimizing the device design and fabrication process, the device operates in the slightly under-coupled regime with a record intrinsic Q factor of 8.0 &#x00D7; 10⁵, which offers a high sensitivity and low detection limit. In surface mass detection, a surface mass density of 12.7 pg/mm² of bovine serum albumin is detected due to the physical adsorption. The noise-equivalent detection limit is approximately 5.3 pg/mm² in a wavelength-shift scheme and 55.9 fg/mm² in an intensity-variation scheme. These results show that the best sensing performance with the on-chip polymer ring resonator system is achieved.