Numerical research on whispering-gallery modes in a triple-layer-coated microsphere resonator

Abstract

We numerically demonstrate that whispering-gallery modes (WGMs) in a microsphere resonator with three layers of high, low and high refractive index (RI) are analyzed by using the finite difference time domain (FDTD) method. To make the light couple in and out of the microsphere, a phase matched waveguide is used to overlap the WGMs evanescent radiation field. By changing the gap between the microsphere and waveguide, the WGMs of two high-RI layers are efficiently excited. The stored energy and the mode volume are optimized for sensing applications. The coupling structure reveals a good sensitivity of 38.29 nm/RIU (RI unit).

References

[1] VahalaK J. Nature, 2003, 424: 839

[2] YangS, WangY, SunH. Advanced Optical Materials, 2015, 3: 1136

[3] DongY, WangK, JinX. Applied Optics, 2015, 54: 277

[4] BaoJ, YuK, WangL, YinJ. Optoelectronics Letters, 2017, 13: 268

[5] LiJ, XiaoY, DongW, ZhangX. Optoelectronics Letters, 2016, 12: 276

[6] RighiniG C, SoriaS. Sensors, 2016, 16: 905

[7] ForemanM R, SwaimJ D, VollmerF. Advances in Optics and Photonics, 2015, 7: 168

[8] HanumegowdaN M, SticaC J, PatelB C, WhiteI M, FanX. Applied Physics Letters, 2005, 87: 201107

[9] IT, SA. Journal of the Optical Society of America B, 2007, 24: 653

[10] TeraokaI, ArnolS. Optics Letters, 2007, 32: 1147

[11] HallJ M, AfsharV S, HendersonM R, ReynoldsT, RiesenN, MonroT M. Optics Express, 2015, 23: 9924

[12] JinX, WangJ, WangM, DongY, LiF, WangK. Applied Optics, 2017, 56: 8023

[13] WangM Y, JinX Y, WangJ, ChenL M, WangK Y. Acta Photonica Sinica, 2017, 46: 0706003

[14] ShenZ, ZhouZ H, ZouC L, SunF W, GuoG P, DongC H, GuoG C. Photonics Research, 2015, 3: 243

[15] ParkJ, OzdemirS K, MonifiF, ChadhaT, HuangS H, BiswasP, YangL. Advanced Optical Materials, 2014, 2: 711

[16] ChoyJ T, BradleyJ D, DeotareP B, BurgessI B, EvansC C, MazurE, LončarM. Optics Letters, 2012, 37: 539

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