Vahala, K. J. Optical microcavities.Nature424, 839-846 (2003)..

Gaeta, A. L., Lipson, M.&Kippenberg, T. J. Photonic-chip-based frequency combs.Nat. Photonics13, 158-169 (2019)..

Spencer, D. T. et al. An optical-frequency synthesizer using integrated photonics.Nature557, 81-85 (2018)..

Xiao, Y. F. et al. Tunneling-induced transparency in a chaotic microcavity.Laser Photonics Rev.7, L51-L54 (2013)..

Liu, Z. P. et al. High-Qasymmetric polymer microcavities directly fabricated by two-photon polymerization.Appl. Phys. Lett.102, 221108 (2013)..

Shao, L. B. et al. Ultrahigh-Q, largely deformed microcavities coupled by a free-space laser beam.Appl. Phys. Lett.103, 121102 (2013)..

Liu, Z. P. et al. Direct laser writing of whispering gallery microcavities by two-photon polymerization.Appl. Phys. Lett.97, 211105 (2010)..

Li, B. B. et al. Experimental observation of Fano resonance in a single whispering-gallery microresonator.Appl. Phys. Lett.98, 021116 (2011)..

Liu, Y. C. et al. Coupling of a single diamond nanocrystal to a whispering-gallery microcavity:photon transport benefitting from rayleigh scattering.Phys. Rev. A84, 011805(R) (2011)..

Li, B. B. et al. Experimental controlling of Fano resonance in indirectly coupled whispering-gallery microresonators.Appl. Phys. Lett.100, 021108 (2012)..

Liu, Y. C. et al. Cavity-QED treatment of scattering-induced free-space excitation and collection in high-Qwhispering-gallery microcavities.Phys. Rev. A85, 013843 (2012)..

Jiang, X. F. et al. Chaos-assisted broadband momentum transformation in optical microresonators.Science358, 344-347 (2017)..

Lei, F. C. et al. Enhanced directional coupling of light with a whispering gallery microcavity.ACS Photonics(2020)..

Vollmer, F.&Yang, L. Label-free detection with high-Q microcavities: a review of biosensing mechanisms for integrated devices.Nanophotonics1, 267-291 (2012)..

Wang, C. Q. et al. Electromagnetically induced transparency at a chiral exceptional point.Nat. Phys.(2020)..

Foreman, M. R., Swaim, J. D.&Vollmer, F. Whispering gallery mode sensors.Adv. Opt. Photonics7, 168-240 (2015)..

Kippenberg, T. J.&Vahala, K. J. Cavity optomechanics: back-action at the mesoscale.Science321, 1172-1176 (2008)..

Aspelmeyer, M., Kippenberg, T. J.&Marquardt, F. Cavity optomechanics.Rev. Mod. Phys.86, 1391-1452 (2014)..

Peng, B. et al. Parity-time-symmetric whispering-gallery microcavities.Nat. Phys.10, 394-398 (2014)..

Wang, L. et al. Statistics of chaotic resonances in an optical microcavity.Phys. Rev. E93, 040201(R) (2016)..

Shu, F. J. et al. A scatterer-assisted whispering-gallery-mode microprobe.Nanophotonics7, 1455-1460 (2018)..

Yang, Q. F. et al. Dynamical tunneling-assisted coupling of high-Qdeformed microcavities using a free-space beam.Phys. Rev. A88, 023810 (2013)..

Matsko, A. B.&Ilchenko, V. S. Optical resonators with whispering-gallery modes-Part I: basics.IEEE J. Sel. Top. Quantum Electron.12, 3-14 (2006)..

Savchenkov, A. A. et al. Whispering-gallery-mode resonators as frequency references. Ⅱ. Stabilization.J. Optical Soc. Am. B24, 2988-2997 (2007)..

Ilchenko, V. S.&Gorodetskii, M. L. Thermal nonlinear effects in optical whispering gallery microresonators.Laser Phys.2, 1004-1009 (1992)..

Carmon, T., Yang, L.&Vahala, K. J. Dynamical thermal behavior and thermal self-stability of microcavities.Opt. Express12, 4742-4750 (2004)..

Padmaraju, K.&Bergman, K. Resolving the thermal challenges for silicon microring resonator devices.Nanophotonics3, 269-281 (2014)..

Chai, C. Z. et al. Thermal bistability of magnon in yttrium iron garnet microspheres.Appl. Phys. Lett.114, 021101 (2019)..

Lim, J. et al. Chasing the thermodynamical noise limit in whispering-gallery-mode resonators for ultrastable laser frequency stabilization.Nat. Commun.8, 8 (2017)..

Grudinin, I. S.&Vahala, K. J. Thermal instability of a compound resonator.Opt. Express17, 14088-14098 (2009)..

Jiang, X. F. et al. Whispering gallery microsensors: a review. Preprint at (2018).

Shao, L. B. et al. Detection of single nanoparticles and lentiviruses using microcavity resonance broadening.Adv. Mater.25, 5616-5620 (2013)..

Zhu, J. G. et al. On-chip single nanoparticle detection and sizing by mode splitting in an ultrahigh-Q microresonator.Nat. Photonics4, 46-49 (2010)..

Vollmer, F. et al. Protein detection by optical shift of a resonant microcavity.Appl. Phys. Lett.80, 4057-4059 (2002)..

Huang, S. H. et al. Whispering gallery mode resonator sensor for in situ measurements of hydrogel gelation.Opt. Express26, 51-62 (2018)..

Yu, X. C. et al. Single nanoparticle detection and sizing using a nanofiber pair in an aqueous environment.Adv. Mater.26, 7462-7467 (2014)..

Xu, X. Y. et al. Phone-sized whispering-gallery microresonator sensing system.Opt. Express24, 25905-25910 (2016)..

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

Fan, X. D.&Yun, S. H. The potential of optofluidic biolasers.Nat. Methods11, 141-147 (2014)..

Jiang, X. F. et al. Chip-based silica microspheres for cavity optomechanics.Opt. Express23, 27260-27265 (2015)..

Monifi, F. et al. Optomechanically induced stochastic resonance and chaos transfer between optical fields.Nat. Photonics10, 399-405 (2016)..

Dong, C. H. et al. Optomechanical dark mode.Science338, 1609-1613 (2012)..

Yang, L., Armani, D. K.&Vahala, K. J. Fiber-coupled erbium microlasers on a chip.Appl. Phys. Lett.83, 825-826 (2003)..

Jiang, X. F. et al. Whispering-gallery microcavities with unidirectional laser emission.Laser Photonics Rev.10, 40-61 (2016)..

He, L. N., Özdemir, Ş. K.&Yang, L. Whispering gallery microcavity lasers.Laser Photonics Rev.7, 60-82 (2013)..

Jiang, X. F. et al. Highly unidirectional emission and ultralow-threshold lasing from on-chip ultrahigh-Q microcavities.Adv. Mater.24, OP260-OP264 (2012)..

Midya, B. et al. Supersymmetric microring laser arrays.Photonics Res.7, 363-367 (2019)..

Li, Y. H. et al. Whispering gallery mode microresonator for nonlinear optics. Preprint at: (2018).

Lin, G. P. et al. Nonlinear photonics with high-Qwhispering-gallery-mode resonators.Adv. Opt. Photonics9, 828-890 (2017)..

Strekalov, D. V. et al. Nonlinear and quantum optics with whispering gallery resonators.J. Opt.18, 123002 (2016)..

Jiang, X. F. et al. Free-space coupled, ultralow-threshold Raman lasing from a silica microcavity.Appl. Phys. Lett.103, 101102 (2013)..

Yang, Y. et al. Four-wave mixing parametric oscillation and frequency comb generation at visible wavelengths in a silica microbubble resonator.Opt. Lett.41, 5266-5269 (2016)..

Huang, S. H. et al. Surface-enhanced Raman scattering on dielectric microspheres with whispering gallery mode resonance.Photon. Res.6, 346-356 (2018)..

Kasumie, S. et al. Raman laser switching induced by cascaded light scattering.Laser Photonics Rev.13, 1900138 (2019)..

Peng, B. et al. Loss-induced suppression and revival of lasing.Science346, 328-332 (2014)..

Zhang, J. et al. A phonon laser operating at an exceptional point.Nat. Photonics12, 479-484 (2018)..

Zhu, J. G. et al. Optothermal spectroscopy of whispering gallery microresonators.Appl. Phys. Lett.99, 171101 (2011)..

Chen, W. J. et al. A simple method for characterizing and engineering thermal relaxation of an optical microcavity.Appl. Phys. Lett.109, 061103 (2016)..

Joshi, C. et al. Thermally controlled comb generation and soliton modelocking in microresonators.Opt. Lett.41, 2565-2568 (2016)..

Carmon, T. et al. Feedback control of ultra-high-Q microcavities: application to micro-Raman lasers and micro-parametric oscillators.Opt. Express13, 3558-3566 (2005)..

McRae, T. G. et al. Thermo-optic locking of a semiconductor laser to a microcavity resonance.Opt. Express17, 21977-21985 (2009)..

Heylman, K. D. et al. Optical microresonators as single-particle absorption spectrometers.Nat. Photonics10, 788-795 (2016)..

Knapper, K. A. et al. Single-particle photothermal imaging via inverted excitation through high-Q all-glass toroidal microresonators.Opt. Express26, 25020-25030 (2018)..

Knapper, K. A. et al. Chip-scale fabrication of high-Qall-glass toroidal microresonators for single-particle label-free imaging.Adv. Mater.28, 2945-2950 (2016)..

Liu, X. F. et al. Optothermal control of gains in erbium-doped whispering-gallery microresonators.Opt. Lett.43, 326-329 (2018)..

Wang, T. et al. Optothermal control of the Raman gain enhanced ringing inmicroresonators.EPL (Europhys. Lett.)124, 14002 (2018)..

Wang, T. et al. Rapid and high precision measurement of opto-thermal relaxation with pump-probe method.Sci. Bull.63, 287-292 (2018)..

Sounas, D. L.&Alù, A. Non-reciprocal photonics based on time modulation.Nat. Photonics11, 774-783 (2017)..

Fan, L. et al. Silicon optical diode with 40 dB nonreciprocal transmission.Opt. Lett.38, 1259-1261 (2013)..

He, L. N. et al. Oscillatory thermal dynamics in high-QPDMS-coated silica toroidal microresonators.Opt. Express17, 9571-9581 (2009)..

Luo, Z. C. et al. MHz-level self-sustained pulsation in polymer microspheres on a chip.AIP Adv.4, 122902 (2014)..

Deng, Y. et al. Thermo-optomechanical oscillator for sensing applications.Opt. Express21, 4653-4664 (2013)..

Fomin, A. E. et al. Nonstationary nonlinear effects in optical microspheres.J. Opt. Soc. Am. B22, 459-465 (2005)..

Park, Y. S.&Wang, H. L. Regenerative pulsation in silica microspheres.Opt. Lett.32, 3104-3106 (2007)..

Deng, Y. et al. Thermo-optomechanical oscillations in high-QZBLAN microspheres.Opt. Lett.38, 4413-4416 (2013)..

Diallo, S., Lin, G. P.&Chembo, Y. K. Giant thermo-optical relaxation oscillations in millimeter-size whispering gallery mode disk resonators.Opt. Lett.40, 3834-3837 (2015)..

Baker, C. et al. Optical instability and self-pulsing in silicon nitride whispering gallery resonators.Opt. Express20, 29076-29089 (2012)..

Wang, J. et al. Thermo-optic effects in on-chip lithium niobate microdiskresonators.Opt. Express24, 21869-21879 (2016)..

Sun, X. et al. Nonlinear optical oscillation dynamics in high-Q lithium niobate microresonators.Opt. Express25, 13504-13516 (2017)..

Yang, Y. et al. Tunable erbium-doped microbubble laser fabricated by sol-gel coating.Opt. Express25, 1308-1313 (2017)..

Linslal, C. L. et al. Tuning whispering gallery lasing modes from polymer fibers under tensile strain.Opt. Lett.41, 551-554 (2016)..

Chen, Y. et al. Tunable Raman laser in a hollow bottle-like microresonator.Opt. Express25, 16879-16887 (2017)..

Monifi, F. et al. A robust and tunable add-drop filter using whispering gallery mode microtoroid resonator.J. Lightwave Technol.30, 3306-3315 (2012)..

Aoki, T. et al. Observation of strong coupling between one atom and a monolithic microresonator.Nature443, 671-674 (2006)..

von Klitzing, W. et al. Frequency tuning of the whispering-gallery modes of silica microspheres for cavity quantum electrodynamics and spectroscopy.Opt. Lett.26, 166-168 (2001)..

Ward, J. M.&Chormaic, S. N. Thermo-optical tuning of whispering gallery modes in Er: Yb co-doped phosphate glass microspheres.Appl. Phys. B: Lasers Opt.100, 847-850 (2010)..

Lee, B. S. et al. On-chip thermo-optic tuning of suspended microresonators.Opt. Express25, 12109-12120 (2017)..

Liu, S. et al. Strain-based tunable optical microresonator with an in-fiber rectangular air bubble.Opt. Lett.43, 4077-4080 (2018)..

Zhou, Z. H. et al. Broadband tuning of the optical and mechanical modes in hollow bottle-like microresonators.Opt. Express25, 4046-4053 (2017)..

Dinyari, K. N. et al. Mechanical tuning of whispering gallery modes over a 05 THz tuning range with MHz resolution in a silica microsphere at cryogenic temperatures.Opt. Express19, 17966-17972 (2011)..

Yang, C. K. et al. Electrically tunable whispering gallery mode microresonator based on a grapefruit-microstructured optical fiber infiltrated with nematic liquid crystals.Opt. Lett.42, 2988-2991 (2017)..

Humar, M. et al. Electrically tunable liquid crystal optical microresonators.Nat. Photonics3, 595-600 (2009)..

Mur, M. et al. Magnetic-field tuning of whispering gallery mode lasing from ferromagnetic nematic liquid crystal microdroplets.Opt. Express25, 1073-1083 (2017)..

Shainline, J. M. et al. Broad tuning of whispering-gallery modes in silicon microdisks.Opt. Express18, 14345-14352 (2010)..

Henze, R. et al. Tuning whispering gallery modes using internal aerostatic pressure.Opt. Lett.36, 4536-4538 (2011)..

Henze, R., Ward, J. M.&Benson, O. Temperature independent tuning of whispering gallery modes in a cryogenic environment.Opt. Express21, 675-680 (2013)..

Gil-Santos, E. et al. Scalable high-precision tuning of photonic resonators by resonant cavity-enhanced photoelectrochemical etching.Nat. Commun.8, 14267 (2017)..

Liu, X. F. et al. Fabrication of a microtoroidal resonator with picometer precise resonant wavelength.Opt. Lett.41, 3603-3606 (2016)..

Koehler, L. et al. Direct thermo-optical tuning of silicon microresonators for the mid-infrared.Opt. Express26, 34965-34976 (2018)..

Kippenberg, T. J. et al. Dissipative Kerr solitons in optical microresonators.Science361, eaan8083 (2018)..

Yu, M. J. et al. Silicon-chip-based mid-infrared dual-comb spectroscopy.Nat. Commun.9, 1869 (2018)..

Dutt, A. et al. On-chip dual-comb source for spectroscopy.Sci. Adv.4, e1701858 (2018)..

Yu, M. J. et al. Mode-locked mid-infrared frequency combs in a silicon microresonator.Optica3, 854-860 (2016)..

Suh, M. G. et al. Microresonator soliton dual-comb spectroscopy.Science354, 600-603 (2016)..

Yang, Q. F. et al. Vernier spectrometer using counterpropagating soliton microcombs.Science363, 965-968 (2019)..

Okawachi, Y. et al. Octave-spanning frequency comb generation in a silicon nitride chip.Opt. Lett.36, 3398-3400 (2011)..

Del'Haye, P. et al. Optical frequency comb generation from a monolithic microresonator.Nature450, 1214-1217 (2007)..

Yu, M. J. et al. Gas-phase microresonator-based comb spectroscopy without an external pump laser.ACS Photonics5, 2780-2785 (2018)..

Kessler, T. et al. A sub-40-mHz-linewidth laser based on a silicon single-crystal optical cavity.Nat. Photonics6,687-692 (2012)..

Herr, T. et al. Temporal solitons in optical microresonators.Nat. Photonics8, 145-152 (2014)..

Yi, X. et al. Soliton frequency comb at microwave rates in a high-Qsilica microresonator.Optica2, 1078-1085 (2015)..

Joshi, C. et al. Counter-rotating cavity solitons in a silicon nitride microresonator.Opt. Lett.43, 547-550 (2018)..

Guan, G., Arnold, S.&Otugen, M. V. Temperature measurements using a microoptical sensor based on whispering gallery modes.AIAA J.44, 2385-2389 (2006)..

Nam, S. H.&Yin, S. Z. High-temperature sensing using whispering gallery mode resonance in bent optical fibers.IEEE Photonics Technol. Lett.17, 2391-2393 (2005)..

Guha, B., Cardenas, J.&Lipson, M. Athermal silicon microring resonators with titanium oxide cladding.Opt. Express21, 26557-26563 (2013)..

Li, B. B. et al. On chip, high-sensitivity thermal sensor based on high-Qpolydimethylsiloxane-coated microresonator.Appl. Phys. Lett.96, 251109 (2010)..

Dong, C. H. et al. Fabrication of high-Qpolydimethylsiloxane optical microspheres for thermal sensing.Appl. Phys. Lett.94, 231119 (2009)..

Yan, Y. Z. et al. Packaged silica microsphere-taper coupling system for robust thermal sensing application.Opt. Express19, 5753-5759 (2011)..

Luo, R. et al. Self-referenced temperature sensing with a lithium niobate microdisk resonator.Opt. Lett.42, 1281-1284 (2017)..

Ioppolo, T.&Rubino, E. Magnetic field-induced morphology-dependent resonances of a coupled composite metglas slab with a polymeric optical resonator.J. Polym. Sci. Part B: Polym. Phys.52, 272-275 (2014)..

Xu, L. H. et al. High-Qsilk fibroin whispering gallery microresonator.Opt. Express24, 20825-20830 (2016)..

Wang, Y. et al. Tapered optical fiber waveguide coupling to whispering gallery modes of liquid crystal microdroplet for thermal sensing application.Opt. Express25, 918-926 (2017)..

Liu, Z. H. et al. Whispering gallery mode temperature sensor of liquid microresonastor.Opt. Lett.41, 4649-4652 (2016)..

Ward, J. M., Yang, Y.&Chormaic, S. N. Highly sensitive temperature measurements with liquid-core.IEEE Photonics Technol. Lett.25, 2350-2353 (2013)..

Chen, X. G. et al. Packaged droplet microresonator for thermal sensing with high sensitivity.Sensors18, 3881 (2018)..

Ilchenko, V. S. et al. Nonlinear optics and crystalline whispering gallery mode cavities.Phys. Rev. Lett.92, 043903 (2004)..

Wu, R. B. et al. Lithium niobate micro-disk resonators of quality factors above 107.Opt. Lett.43, 4116-4119 (2018)..

Black, E. D. An introduction to Pound-Drever-Hall laser frequency stabilization.Am. J. Phys.69, 79-87 (2001)..

Suter, J. D. et al. Thermal characterization of liquid core optical ring resonator sensors.Appl. Opt.46, 389-396 (2007)..

Han, M.&Wang, A. B. Temperature compensation of optical microresonators using a surface layer with negative thermo-optic coefficient.Opt. Lett.32, 1800-1802 (2007)..

He, L. et al. Compensation of thermal refraction effect in high-Qtoroidal microresonator by polydimethylsiloxane coating.Appl. Phys. Lett.93, 201102 (2008)..

Xie, C. F. et al. Compensation of thermal nonlinear effect in hybrid microsphere resonators.Micro Nano Lett.9, 609-612 (2014)..

Zhi, Y.&Meldrum, A. Tuning a microsphere whispering-gallery-mode sensor for extreme thermal stability.Appl. Phys. Lett.105, 031902 (2014)..

Kim, E. et al. Thermal characterisation of (bio)polymers with a temperature-stabilised whispering gallery mode microsensor.Appl. Phys. Lett.106, 161101 (2015)..

Grudinin, I. et al. Compensation of thermal nonlinearity effect in optical resonators.Opt. Express19, 7365-7372 (2011)..

Strekalov, D. V. et al. Temperature measurement and stabilization in a birefringent whispering gallery mode resonator.Opt. Express19, 14495-14501 (2011)..

Fescenko, I. et al. Dual-mode temperature compensation technique for laser stabilization to a crystalline whispering gallery mode resonator.Opt. Express20, 19185-19193 (2012)..

Baumgartel, L. M., Thompson, R. J.&Yu, N. Frequency stability of a dual-mode whispering gallery mode optical reference cavity.Opt. Express20, 29798-29806 (2012)..

Weng, W. L., Anstie, J. D.&Luiten, A. N. Refractometry with ultralow detection limit using anisotropic whispering-gallery-mode resonators.Phys. Rev. Appl.3, 044015 (2015)..

Swaim, J. D., Knittel, J.&Bowen, W. P. Detection of nanoparticles with a frequency locked whispering gallery mode microresonator.Appl. Phys. Lett.102, 183106 (2013)..