title: Ultrahigh sensing based on feedback double ring configuration beyond the limitation of quality factor on sensitivity.
abstract: In this article, we present a simple method to realize a sensor of ultrahigh sensitivity and compact size by employing a feedback double ring resonator. We demonstrate that this method has not only a higher sensitivity than an optimal add-drop resonator (ADR), but also a relatively high performance when the Q factor drops. Furthermore, we show that this sensing system can overcome the limitation of Q factor on system sensitivity by 2 orders of magnitude in comparison to the corresponding ADR. Thus, the proposal in this paper provides a promising and feasible scheme to realize a highly effective sensor that is weakly dependent on the Q factor of the system.
authors.affiliation: National Key Laboratory of Tunable Laser Technology, Institute of Opto-Electronics, Harbin Institute of Technology, Harbin, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Yundong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yulong
authors.initials: Y
authors.lastname: Gai
authors.forename: Xuenan
authors.initials: X
authors.lastname: Zhang
authors.forename: Ping
authors.initials: P
authors.lastname: Yuan
mesh_terms: D015374:Biosensing Techniques; D004784:Environmental Monitoring / Q000379:methods*; D004867:Equipment Design; D005336:Fiber Optic Technology; D007368:Interferometry / Q000379:methods; D055096:Optical Devices; D055095:Optics and Photonics; D015203:Reproducibility of Results