[1] J. Su. Label-free single exosome detection using frequency-locked microtoroid optical resonators. ACS Photon., 2, 1241-1245(2015).

[2] J. Su. Label-free biological and chemical sensing using whispering gallery mode optical resonators: past, present, and future. Sensors, 17, 540(2017).

[3] J. Su, A. F. Goldberg, B. M. Stoltz. Label-free detection of single nanoparticles and biological molecules using microtoroid optical resonators. Light Sci. Appl., 5, e16001(2016).

[4] J. D. Swaim, J. Knittel, W. P. Bowen. Detection limits in whispering gallery biosensors with plasmonic enhancement. Appl. Phys. Lett., 99, 243109(2011).

[5] F. Vollmer, L. Yang. Review label-free detection with high-Q microcavities: a review of biosensing mechanisms for integrated devices. Nanophotonics, 1, 267-291(2012).

[6] Y. Zhi, X.-C. Yu, Q. Gong, L. Yang, Y.-F. Xiao. Single nanoparticle detection using optical microcavities. Adv. Mater., 29, 1604920(2017).

[7] D. K. Armani, T. J. Kippenberg, S. M. Spillane, K. J. Vahala. Ultra-high-Q toroid microcavity on a chip. Nature, 421, 925-928(2003).

[8] M. R. Foreman, J. D. Swaim, F. Vollmer. Whispering gallery mode sensors. Adv. Opt. Photon., 7, 168-240(2015).

[9] F. Vollmer, S. Arnold, D. Braun, I. Teraoka, A. Libchaber. Multiplexed DNA quantification by spectroscopic shift of two microsphere cavities. Biophys. J., 85, 1974-1979(2003).

[10] M. D. Baaske, M. R. Foreman, F. Vollmer. Single-molecule nucleic acid interactions monitored on a label-free microcavity biosensor platform. Nat. Nanotechnol., 9, 933-939(2014).

[11] S. I. Shopova, R. Rajmangal, S. Holler, S. Arnold. Plasmonic enhancement of a whispering-gallery-mode biosensor for single nanoparticle detection. Appl. Phys. Lett., 98, 243104(2011).

[12] Y. Gao, N. Zhou, Z. Shi, X. Guo, L. Tong. Dark dimer mode excitation and strong coupling with a nanorod dipole. Photon. Res., 6, 887-892(2018).

[13] T.-S. Deng, J. Parker, Y. Yifat, N. Shepherd, N. F. Scherer. Dark plasmon modes in symmetric gold nanoparticle dimers illuminated by focused cylindrical vector beams. J. Phys. Chem. C, 122, 27662-27672(2018).

[14] D. E. Gómez, Z. Q. Teo, M. Altissimo, T. J. Davis, S. Earl, A. Roberts. The dark side of plasmonics. Nano Lett., 13, 3722-3728(2013).

[15] D. E. Gómez, K. C. Vernon, T. J. Davis. Symmetry effects on the optical coupling between plasmonic nanoparticles with applications to hierarchical structures. Phys. Rev. B, 81, 075414(2010).

[16] J.-S. Huang, J. Kern, P. Geisler, P. Weinmann, M. Kamp, A. Forchel, P. Biagioni, B. Hecht. Mode imaging and selection in strongly coupled nanoantennas. Nano Lett., 10, 2105-2110(2010).

[17] A. Kaplan, M. Tomes, T. Carmon, M. Kozlov, O. Cohen, G. Bartal, H. G. L. Schwefel. Finite element simulation of a perturbed axial-symmetric whispering-gallery mode and its use for intensity enhancement with a nanoparticle coupled to a microtoroid. Opt. Express, 21, 14169-14180(2013).

[18] M. L. Gorodetsky, A. A. Savchenkov, V. S. Ilchenko. Ultimate Q of optical microsphere resonators. Opt. Lett., 21, 453-455(1996).

[19] T. J. A. Kippenberg. Nonlinear optics in ultra-high Q whispering-gallery optical microcavities(2004).

[20] R. A. Waldron. Perturbation theory of resonant cavities. Proc. IEE, 107, 272-274(1960).

[21] H. A. Haus. Waves and Fields in Optoelectronics(1984).

[22] S. Arnold, M. Khoshsima, I. Teraoka, S. Holler, F. Vollmer. Shift of whispering-gallery modes in microspheres by protein adsorption. Opt. Lett., 28, 272-274(2003).

[23] L. Novotny, B. Hecht. Principles of Nano-Optics(2012).

[24] H. Chen, L. Shao, Q. Li, J. Wang. Gold nanorods and their plasmonic properties. Chem. Soc. Rev., 42, 2679-2724(2013).

[25] D. P. Sprünken, H. Omi, K. Furukawa, H. Nakashima, I. Sychugov, Y. Kobayashi, K. Torimitsu. Influence of the local environment on determining aspect-ratio distributions of gold nanorods in solution using Gans theory. J. Phys. Chem. C, 111, 14299-14306(2007).

[26] C. F. Bohren, D. R. Huffman. Absorption and Scattering of Light by Small Particles(2008).

[27] S. W. Prescott, P. Mulvaney. Gold nanorod extinction spectra. J. Appl. Phys., 99, 123504(2006).

[28] F. Ruesink, H. M. Doeleman, E. Verhagen, A. F. Koenderink. Controlling nanoantenna polarizability through backaction via a single cavity mode. Phys. Rev. Lett., 120, 206101(2018).

[29] L. Novotny. Effective wavelength scaling for optical antennas. Phys. Rev. Lett., 98, 266802(2007).

[30] V. R. Dantham, S. Holler, C. Barbre, D. Keng, V. Kolchenko, S. Arnold. Label-free detection of single protein using a nanoplasmonic-photonic hybrid microcavity. Nano Lett., 13, 3347-3351(2013).

[31] B. E. Little, S. T. Chu, H. A. Haus. Microring resonator channel dropping filters. J. Lightwave Technol., 15, 998-1005(1997).

[32] W. Suh, Z. Wang, S. Fan. Temporal coupled-mode theory and the presence of non-orthogonal modes in lossless multimode cavities. IEEE J. Quantum Electron., 40, 1511-1518(2004).

[33] A. Yariv. Universal relations for coupling of optical power between microresonators and dielectric waveguides. Electron. Lett., 36, 321-322(2000).

[34] J. Alegret, T. Rindzevicius, T. Pakizeh, Y. Alaverdyan, L. Gunnarsson, M. Käll. Plasmonic properties of silver trimers with trigonal symmetry fabricated by electron-beam lithography. J. Phys. Chem. C, 112, 14313-14317(2008).

[35] S. L. Teo, V. K. Lin, R. Marty, N. Large, E. A. Llado, A. Arbouet, C. Girard, J. Aizpurua, S. Tripathy, A. Mlayah. Gold nanoring trimers: a versatile structure for infrared sensing. Opt. Express, 18, 22271-22282(2010).

[36] T. J. Davis, D. E. Gómez, K. C. Vernon. Simple model for the hybridization of surface plasmon resonances in metallic nanoparticles. Nano Lett., 10, 2618-2625(2010).

[37] A. M. Funston, T. J. Davis, C. Novo, P. Mulvaney. Coupling modes of gold trimer superstructures. Philos. Trans. R. Soc. A, 369, 3472-3482(2011).

[38] T. J. Davis, K. C. Vernon, D. E. Gómez. Designing plasmonic systems using optical coupling between nanoparticles. Phys. Rev. B, 79, 155423(2009).

[39] A. Ashkin, J. M. Dziedzic, J. E. Bjorkholm, S. Chu. Observation of a single-beam gradient force optical trap for dielectric particles. Opt. Lett., 11, 288-290(1986).

[40] J. E. Melzer, E. McLeod. Fundamental limits of optical tweezer nanoparticle manipulation speeds. ACS Nano, 12, 2440-2447(2018).

[41] P. B. Johnson, R. W. Christy. Optical constants of the noble metals. Phys. Rev. B, 6, 4370-4379(1972).

[42] M. Oxborrow. Traceable 2-D finite-element simulation of the whispering-gallery modes of axisymmetric electromagnetic resonators. IEEE Trans. Microwave Theory Tech., 55, 1209-1218(2007).

[43] J.-P. Berenger. A perfectly matched layer for the absorption of electromagnetic waves. J. Comput. Phys., 114, 185-200(1994).

[44] B. Min, L. Yang, K. Vahala. Perturbative analytic theory of an ultrahigh-Q toroidal microcavity. Phys. Rev. A, 76, 013823(2007).

[45] M. Oxborrow. Configuration of COMSOL Multiphysics for simulating axisymmetric dielectric resonators: explicit weak-form expressions axisymmetric electromagnetic resonators.

[46] J. Zhu, S. K. Ozdemir, Y.-F. Xiao, L. Li, L. He, D.-R. Chen, L. Yang. On-chip single nanoparticle detection and sizing by mode splitting in an ultrahigh-Q microresonator. Nat. Photonics, 4, 46-49(2010).