Acoustically tunable optical transmission through a subwavelength hole with a bubble

Greentree

2017

Phys. Rev. A

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Plasmonics allows manipulating light at the nanoscale, but has limitations due to the static nature of nanostructures and lack of tuneability. We propose and theoretically analyse a roomtemperature liquid-metal nanodroplet that changes its shape, and therefore tunes the plasmon resonance frequency, due to capillary oscillations. We show the possibility to tune the capillary oscillation frequency of the nanodroplet and to drive the oscillations electrically or mechanically. Employed as a tuneable nanoantenna, the nanodroplet may find applications in sensors, imaging, microscopy, and medicine.

mentioning

confidence: 99%

Dynamically reconfigurable plasmon resonances enabled by capillary oscillations of liquid-metal nanodroplets

Greentree

2017

Phys. Rev. A

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“…This is because damping is not taken into account in this model. This resonant tail disappears when acoustic losses are taken into account [110].…”

Section: Fig 5: (A) Theoretical Response Of a 100-nm-radius Air Bubbmentioning

confidence: 97%

“…Here, the bubble is located in and the light is transmitted through a 300-nm-wide circular, water-filled hole in a 400-nm-thick silver film. Reprinted with permission from [110].…”

Section: Fig 5: (A) Theoretical Response Of a 100-nm-radius Air Bubbmentioning

confidence: 99%

Coupling light and sound: giant nonlinearities from oscillating bubbles and droplets

Greentree

2019

Nanophotonics

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Nonlinear optical processes are vital for fields including telecommunications, signal processing, data storage, spectroscopy, sensing, and imaging. As an independent research area, nonlinear optics began with the invention of the laser, because practical sources of intense light needed to generate optical nonlinearities were not previously available. However the high power requirements of many nonlinear optical systems limit their use, especially in portable or medical applications, and so there is a push to develop new materials and resonant structures capable of producing nonlinear optical phenomena with low-power light emitted by inexpensive and compact sources. Acoustic nonlinearities, especially giant acoustic nonlinear phenomena in gas bubbles and liquid droplets, are much stronger than their optical counterparts. Here, we suggest employing acoustic nonlinearities to generate new optical frequencies, thereby effectively reproducing nonlinear optical processes without the need for laser light. We critically survey the current literature dedicated to the interaction of light with nonlinear acoustic waves and highly-nonlinear oscillations of gas bubbles and liquid droplets. We show that the conversion of acoustic nonlinearities into optical signals is possible with low-cost incoherent light sources such as lightemitting diodes, which would usher new classes of low-power photonic devices that are more affordable for remote communities and developing nations, or where there are demanding requirements on size, weight and power. . 1: (a) Generation of new optical frequencies via a nonlinear optical interaction. High-power monochromatic laser light interacts with the nonlinear optical medium, e.g. a dielectric microresonator, to generate new optical frequencies [9]. (b, c) The nonlinear properties of sound can be used to generate optical nonlinearities without the need for high-power laser light. Low-power light couples to a sound wave via a deformable fluid, e.g. gas bubble or liquidmetal nanoparticle, exploiting strong nonlinear acoustic effects. This converts acoustic frequencies to the optical domain, effectively reproducing the result of the nonlinear optical interaction in (a). Images from www.freeimages.com and www.dreamstime.com. FIG

“…A rigorous analysis of multiresonant magnetofluidic systems requires complex numerical methods 126 . However, in a first approximation, the sound-driven oscillations of air bubbles in a magnetic fluid can be analysed by considering a simple Rayleigh-Plesset equation 122 . A similar strategy may be adopted to analyse liquid droplets 123,125 .…”

Section: Strong Coupling In Magnetofluidic Systemsmentioning

confidence: 99%

Perspective: Strong microwave photon-magnon coupling in multiresonant dielectric antennas

Journal of Applied Physics

2018

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Achieving quantum-level control over electromagnetic waves, magnetisation dynamics, vibrations and heat is invaluable for many practical application and possible by exploiting the strong radiation-matter coupling. Most of the modern strong microwave photon-magnon coupling developments rely on the integration of metal-based microwave resonators with a magnetic material. However, it has recently been realised that all-dielectric resonators made of or containing magneto-insulating materials can operate as a standalone strongly-coupled system characterised by low dissipation losses and strong local microwave field enhancement. Here, after a brief overview of recent developments in the field, I discuss examples of such dielectric resonant systems and demonstrate their ability to operate as multiresonant antennas for light, microwaves, magnons, sound, vibrations and heat. This multiphysics behaviour opens up novel opportunities for the realisation of multiresonant coupling such as, for example, photon-magnon-phonon coupling. I also propose several novel systems in which strong photon-magnon coupling in dielectric antennas and similar structures is expected to extend the capability of existing devices or may provide an entirely new functionality. Examples of such systems include novel magnetofluidic devices, high-power microwave power generators, and hybrid devices exploiting the unique properties of electrical solitons.