FDTD Simulation: Refractive Index and Single-Object Sensing Using a Whispering-Gallery-Modes Microring Resonator
| Autor: | Ming-He Wu, Zhi-Hong Zhang, Shao-Yi Wu, Si-Hui Shang, Qin-Sheng Zhu, Bao-Hua Teng, Mu-Neng Li |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Scattering Physics::Optics Resonance 02 engineering and technology Optical field 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Resonator Light intensity 020210 optoelectronics & photonics Optics Q factor 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Whispering-gallery wave business Refractive index |
| Zdroj: | Journal of Lightwave Technology. 36:1775-1781 |
| ISSN: | 1558-2213 0733-8724 |
| DOI: | 10.1109/jlt.2017.2788561 |
| Popis: | Sensing of whispering-gallery-modes in a microring resonator coated with a fluorescent high-refractive-index film is modeled using finite-difference time-domain method. A short pulse with ultrawide bandwidth in the high-index film spans the circumference of the ring. The spectra of the high-index film and the pulse propagation in time domain were simulated. The results indicate redshifts of the resonance wavelengths with an increasing refractive index inside the ring. A sensitivity of 28.5 nm/RIU is found for the index of 1.48. Considering the effects of scattering and absorption of a single object adhered to the inner surface of the microring, an obvious splitting or broadening of resonance modes is found for sensing. For single particles with a radius of 3 μm, the mode splitting is increased with increasing number of particles from one to nine. The estimation of the size of the particles is also studied based on the mode splitting of the optical field in the ring depends on the scattering of the particles. This work reveals the potential applications of whispering-gallery-modes in a microring resonator coated with a fluorescent high-index film for sensing one or multiple objects and even a single molecule. |
| Databáze: | OpenAIRE |
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