In situ tuning of whispering gallery modes of levitated silica microspheres

Minowa, Yosuke; Toyota, Y.; Ashida, Masaaki

doi:10.1364/josab.34.000c20

Cited by 7 publications

(4 citation statements)

References 48 publications

(56 reference statements)

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“…This work suggests mK temperatures are possible for 10 µm radii silica spheres. In-situ tuning of WGMs by several nm in levitated silica microparticles has been demonstrated [220]. WGMs have been used to cool the c.o.m.…”

Section: B Novel Cooling Mechanismsmentioning

confidence: 99%

Optomechanics with levitated particles

et al. 2020

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Optomechanics is concerned with the use of light to control mechanical objects. As a field, it has been hugely successful in the production of precise and novel sensors, the development of low-dissipation nanomechanical devices, and the manipulation of quantum signals. Micro-and nano-particles levitated in optical fields act as nanoscale oscillators, making them excellent lowdissipation optomechanical objects, with minimal thermal contact to the environment when operating in vacuum. Levitated optomechanics is seen as the most promising route for studying high-mass quantum physics, with the promise of creating macroscopically separated superposition states at masses of 10 6 amu and above. Optical feedback, both using active monitoring or the passive interaction with an optical cavity, can be used to cool the centre-of-mass of levitated nanoparticles well below 1 mK, paving the way to operation in the quantum regime. In addition, trapped mesoscopic particles are the paradigmatic system for studying nanoscale stochastic processes, and have already demonstrated their utility in state-of-the-art force sensing. * Electronic address: james.millen@kcl.ac.uk arXiv:1907.08198v1 [physics.optics] 18 Jul 2019It is a pleasant coincidence, that whilst writing this review the Nobel Prize in Physics 2018 was jointly awarded to the American scientist Arthur Ashkin, for his development of optical tweezers. By focusing a beam of light, small objects can be manipulated through radiation pressure and/or gradient forces. This technology is now available offthe-shelf due to its applicability in the bio-and medical-sciences, where it has found utility in studying cells and other microscopic entities.The pleasant coincidences continue, when one notes that the 2017 Nobel Prize in Physics was awarded to Weiss, Thorne and Barish for their work on the LIGO gravitational wave detector. This amazingly precise experiment is, ultimately, an optomechanical device, where the position of a mechanical oscillator is monitored via its coupling to an optical cavity. The field of optomechanics is in the ascendency [1], showing great promise in the development of quantum technologies and force sensing. These applications are somewhat limited by unavoidable energy dissipation and thermal loading at the nanoscale [2], which despite impressive progress in soft-clamping technology [3] means that these technologies will likely always operate in cryogenic environments.Enter the work of Ashkin: he showed that dielectric particles could be levitated and cooled under vacuum conditions in 1977 [4]. By levitating particles at low pressures, they naturally decouple from the thermal environment, and since the mechanical mode is the centre-of-mass motion of a particle, energy dissipation via strain vanishes. The field of levitated optomechanics really took off in 2010, when three independent proposals illustrated that levitated nanoparticles could be coupled to optical cavities [5][6][7]. This promises cooling to the quantum regime, and state engineering once you are t...

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Section: B Novel Cooling Mechanismsmentioning

confidence: 99%

Optomechanics with levitated particles

et al. 2020

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“…A promising approach for sunlight harvesting is light confinement in a nanoscale field, which occupies the near field via resonance between light and nanostructures. For instance, Mie resonators, − whispering gallery mode, , and photonic crystals , are used for enhancing photochemical reactions using the near field. Micro- and nanosized parabolic antennas are also designed to harvest photon energy. , Localized surface plasmon resonance (LSPR)-enhanced photochemical/photoelectrochemical reactions under visible light irradiation have also been widely studied. − Practical use of the LSPR-enhanced photochemical system is challenging because of its low absorptivity and low charge separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…5,6 A promising approach for sunlight harvesting is light confinement in a nanoscale field, which occupies the near field via resonance between light and nanostructures. For instance, Mie resonators, 7−9 whispering gallery mode, 10,11 and photonic crystals 12,13 are used for enhancing photochemical reactions using the near field. Micro-and nanosized parabolic antennas are also designed to harvest photon energy.…”

Section: ■ Introductionmentioning

confidence: 99%

Strong Light Confinement by a Plasmon-Coupled Parabolic Nanoresonator Array

Oshikiri,

Hayakawa,

Niinomi

et al. 2024

J. Phys. Chem. C

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To achieve artificial photosynthesis using sunlight, the photon-flux density problem must be solved. Here, we designed a parabolic resonator array composed of a curved Ag mirror filled with nickel oxide (NiO) as a dielectric material with p-type semiconductor properties. Then, several types of parabolic resonator arrays were combined with Au nanodiscs (Au-ND/parabolic resonator array) to realize modal coupling. The far-field and near-field properties of the parabolic resonator array and Au-ND/parabolic resonator array were investigated by numerical simulation using the finite-difference timedomain method. The parabolic resonator array harvested light in the near field based on constructive interference. The coupling system between the parabolic resonator array and plasmon modes showed significantly large near-field enhancement of more than 100 |E/E 0 |, which describes the ratio between the induced near-field E and the incident light field E 0 , and high Q-factor, which is the ratio of the resonance frequency and the full width at half-maximum bandwidth of the resonance. It also exhibited robustness for incident light angle fluctuation. This device further achieves the benefits of conventional modal coupling such as absorption enhancement and coherence interaction between plasmonic particles through the resonator.

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“…2,3) Owing to their intrinsically small mode volume and high quality (Q) factor, WGM microcavities are of particular interests and find wide applications. 4,5) Spherical resonators based on LC droplets have been widely used as WGM optical microcavities because of its unique properties. [6][7][8] At present, the most common manufacturing method of LC microdroplets is microfluidic technology.…”

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confidence: 99%

Thermal and electrical tuning of whispering gallery modes in liquid crystal-filled hollow glass microsphere

Xiong¹,

Zhang²,

Hu³

et al. 2019

Appl. Phys. Express

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This paper demonstrates a thermally and electrically tunable hollow glass microsphere resonant cavity filled with dye-doped nematic liquid crystal. We controlled the orientation of in-sphere liquid crystal and encapsulated it with polydimethylsiloxane film. The typical whispering gallery modes (WGMs) lasing spectra were obtained under a pulsed laser pump and the effects of the temperature and electric field on the peaks wavelengths were studied. The WGM spectra present a blueshift significantly with increasing temperature and electric field due to the decrease in the effective refractive index.

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In situ tuning of whispering gallery modes of levitated silica microspheres

Cited by 7 publications

References 48 publications

Optomechanics with levitated particles

Optomechanics with levitated particles

Strong Light Confinement by a Plasmon-Coupled Parabolic Nanoresonator Array

Thermal and electrical tuning of whispering gallery modes in liquid crystal-filled hollow glass microsphere

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