Resonant Frequency Control of a Microspherical Cavity by Temperature Adjustment

Chiba, Akito; Fujiwara, Hideki; Hotta, Jun‐ichi; Takeuchi, Shigeki; Sasaki, Keiji

doi:10.1143/jjap.43.6138

Cited by 34 publications

(26 citation statements)

References 19 publications

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“…If the period of the mechanical (or any coupling noise) oscillation is longer (i.e., the change in temperature is slower) than the thermal response time, then the thermal feedback (i.e., the shifting of the WGMs) has time to enhance or damp the variation in temperature. The thermal decay rate from (i) the optical mode volume to the rest of the silica microsphere was estimated by Schmidt et al [30] to be on the order of microseconds, and (ii) from the rest of the sphere to the surrounding medium was on the order of milliseconds, whereas the thermal shift rate of a silica sphere is around 2.5 GHz/K [39]. At higher oscillation frequencies, the period of the oscillation becomes comparable or less than the thermal response time of the sphere and the thermal feedback should be cut off [30] (e.g., by the pendulum moving) before it has a chance to take effect.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Observation of thermal feedback on the optical coupling noise of a microsphere attached to a low-spring-constant cantilever

Ward

Chormaic

2012

Phys. Rev. A

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Original citationWu, Y., Ward, J. and Nic Chormaic, S. (2012) A silica microsphere on a low-spring-constant cantilever (pendulum) is fabricated and evanescently coupled to a tapered optical fiber. The motion of the pendulum is detected as variations in the transmitted laser power through the tapered fiber. The optical coupling noise created by the pendulum motion is recorded by taking a fast Fourier transform of the transmitted laser power and the fundamental mechanical mode of the pendulum at 1.16 kHz is observed. The thermal damping and amplification of the coupling noise is investigated and the effect of the thermal feedback on the noise spectrum is examined. The response of the thermo-optical feedback to small transient and driven variations in the taper-pendulum separation for different values of laser detuning is demonstrated. Preliminary results on the optical force between the pendulum and the tapered fiber are also presented. Microspherical pendulums, with low mechanical spring constant, could be used for studying nanoscopic optical and mechanical forces, or optical cooling.

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Section: Experimental Setup and Resultsmentioning

confidence: 99%

Observation of thermal feedback on the optical coupling noise of a microsphere attached to a low-spring-constant cantilever

Ward

Chormaic

2012

Phys. Rev. A

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“…The current design of our integrated device was made based on the compromise between the two contradictory requirements. We would like to point out that to realize on-chip tuning of resonant wavelength with external heaters, a significantly longer time (e.g., a few minutes as reported in [24] ) is required to reach the thermal equilibrium.…”

Section: On-chip Tunable Microresonatormentioning

confidence: 99%

On-Chip Tuning of the Resonant Wavelength in a High-Q Microresonator Integrated with a Microheater

Tang

Lin

Song

et al. 2015

International Journal of Optomechatronics

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We report on fabrication of a microtoroid resonator of a high-quality (high-Q) factor integrated with an on-chip microheater. Both the microresonator and microheater are fabricated using femtosecond laser three-dimensional (3-D) micromachining. The microheater, which is located about 200 lm away from the microresonator, has a footprint size of 200 lm Â 400 lm. Tuning of the resonant wavelength in the microresonator has been achieved by varying the voltage applied on the microheater. The response time of the integrated chip is less than 10 seconds.

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“…Various methods for tuning microcavities have already been explored, e.g. external heaters [3][4][5], pressure/strain techniques [6,7], and electro-optical [8], electro-thermal [9] and thermo-optical [10] effects. All of these methods result in relatively small tuning ranges of < 300 GHz.…”

Section: Introductionmentioning

confidence: 99%

Thermo-optical tuning of whispering gallery modes in Er:Yb co-doped phosphate glass microspheres

Ward

Chormaic

2010

Appl. Phys. B

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Access to the full text of the published version may require a subscription. We demonstrate an all-optical, thermally-assisted technique for broad range tuning of whispering gallery modes in microsphere resonators fabricated from an Er:Yb co-doped phosphate glass (IOG-2). The microspheres are pumped at 978 nm and the heat generated by absorption of the pump expands the cavity, thereby altering the cavity size and refractive index. We demonstrate a significant nonlinear tuning range >700 GHz of both C-and L-band cavity emissions via pumping through a tapered optical fibre. Finally, we Rightsshow that large linear tuning up to ~488 GHz is achievable if the microsphere is alternatively heated by coupling laser light into its support stem.

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Resonant Frequency Control of a Microspherical Cavity by Temperature Adjustment

Cited by 34 publications

References 19 publications

Observation of thermal feedback on the optical coupling noise of a microsphere attached to a low-spring-constant cantilever

Observation of thermal feedback on the optical coupling noise of a microsphere attached to a low-spring-constant cantilever

On-Chip Tuning of the Resonant Wavelength in a High-Q Microresonator Integrated with a Microheater

Thermo-optical tuning of whispering gallery modes in Er:Yb co-doped phosphate glass microspheres

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