Frontiers of Optoelectronics

, Volume 10, Issue 2, pp 144–150 | Cite as

Nested microring resonator with a doubled free spectral range for sensing application

  • Xin Zhang
  • Jiawen Jian
  • Han Jin
  • Peipeng Xu
Research Article


The microring resonator has received increasing attention in the optical sensing application because of its micro-size, optical property, and high sensitivity. An additional waveguide is commonly used to change the output spectra in the early research on microring resonators. In this study, we proposed a nested microring resonator that doubles the free spectral range (FSR) compared with the conventional single microring. This structure improved the sensing property as the FSR in the filter output spectra could be considered as a measurement range in the microring sensor. Moreover, the parameters including the coupling coefficient of the three coupling sections, length of the U-bend waveguide, and effective index of a waveguide were tested and carefully selected to optimize the sensing properties. The relationship between these parameters and the output spectra was demonstrated. With linear sensitivity, the structure has a good potential in sensing application.


microring resonator double free spectral range (FSR) sensing application large measurement range 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.



This study was supported by the National Natural Science Foundation of China (Grant Nos. 61601253 and 61501271) and K. C. Wong Magna Fund in Ningbo University.


  1. 1.
    Mi K P, Kee J S, Quah J Y, Netto V, Song J, Fang Q, Fosse E M L, Lo G. Label-free aptamer sensor based on silicon microring resonators. Sensors and Actuators B, Chemical, 2013, 176(6): 552–559Google Scholar
  2. 2.
    Jäger M, Becherer T, Bruns J, Haag R, Petermann K. Antifouling coatings on SOI microring resonators for bio sensing applications. Sensors and Actuators B, Chemical, 2015, 223(4): 400–405Google Scholar
  3. 3.
    Zhao X, Tsai J M, Cai H, Ji X M, Zhou J, Bao M H, Huang Y P, Kwong D L, Liu A Q. A nano-opto-mechanical pressure sensor via ring resonator. Optics Express, 2012, 20(8): 8535–8542CrossRefGoogle Scholar
  4. 4.
    Mi G, Horvath C, Aktary M, Van V. Silicon microring refractometric sensor for atmospheric CO2 gas monitoring. Optics Express, 2016, 24(2): 1773–1780CrossRefGoogle Scholar
  5. 5.
    Zang K, Zhang D, Huo Y, Chen X, Lu C Y, Fei E T, Kamins T I, Feng X, Huang Y, Harris J S. Microring bio-chemical sensor with integrated low dark current Ge photodetector. Applied Physics Letters, 2015, 106(10): 101111CrossRefGoogle Scholar
  6. 6.
    Mao M, Chen S, Dai D. Cascaded ring-resonators for multi-channel optical sensing with reduced temperature sensitivity. IEEE Photonics Technology Letters, 2016, 28(7): 814–817CrossRefGoogle Scholar
  7. 7.
    Zhang C, Chen S, Ling T, Guo L J. Review of imprinted polymer microrings as ultrasound detectors: design, fabrication, and characterization. IEEE Sensors Journal, 2015, 15(6): 3241–3248CrossRefGoogle Scholar
  8. 8.
    Prasad P R, Selvaraja S K, Varma M M. High precision measurement of intensity peak shifts in tunable cascaded microring intensity sensors. Optics Letters, 2016, 41(14): 3153–3156CrossRefGoogle Scholar
  9. 9.
    Xu Q, Fattal D, Beausoleil R G. Silicon microring resonators with 1.5-microm radius. Optics Express, 2008, 16(6): 4309–4315CrossRefGoogle Scholar
  10. 10.
    Lu Y, Fu X, Chu D, Wen W, Yao J. Fano resonance and spectral compression in a ring resonator drop filter with feedback. Optics Communications, 2011, 284(1): 476–479CrossRefGoogle Scholar
  11. 11.
    Li Z, Li X, Sun Y, Li S, Zheng W. Doubled free spectral range of single microring resonator filter. Acta Optica Sinica, 2012, 32(7): 224–229Google Scholar
  12. 12.
    Xiang X Y, Wang K R, Yuan J H, Jin B Y, Sang X Z, Yu C X. Highly sensitive digital optical sensor with large measurement range based on the dual-microring resonator with waveguide-coupled feedback. Chinese Physics B, 2014, 23(3): 034206CrossRefGoogle Scholar

Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Faculty of Electrical Engineering and Computer ScienceNingbo UniversityNingboChina

Personalised recommendations