Nanomechanical motion transduction with a scalable localized gap plasmon architecture

Roxworthy, Brian J.; Aksyuk, Vladimir A.

doi:10.1038/ncomms13746

Cited by 33 publications

(50 citation statements)

References 31 publications

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“…The aforementioned gap‐dependent hybridization can be also described in terms of gap plasmons sustained by a MIM cavity configuration. [ 52,65–67 ] On the contrary, the high‐energy mode ( m = 2) is almost constant over the entire thickness variation, thus assuming less relevance toward the practical implementation of a deformation sensitive device.…”

Section: Resultsmentioning

confidence: 99%

Plasmon Hybridization in Compressible Metal–Insulator–Metal Nanocavities: An Optical Approach for Sensing Deep Sub‐Wavelength Deformation

Carrara

Maccaferri

Cerea

et al. 2020

Advanced Optical Materials

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A pressure‐induced deformation‐sensitive device (DSD) is presented based on 2D matrices of plasmonic gold nanodisks coupled to a metal thin layer through a compressible dielectric spacer, namely a deformable metal–insulator–metal (MIM) nanocavity, to report deep sub‐wavelength size variations (<λ/200). The system is characterized by two hybrid branches, which are resonant in the visible/near infrared spectral region. The fundamental mode, owing to the near‐field interaction between the plasmonic nanostructures and the metal film, exhibits a remarkable sensitivity to the gap size, exceeding that of a planar “macroscopic” optical cavity and extending its operational domain to the sub‐wavelength range, where excellent opportunities toward truly multiscale MIMs‐based pressure sensors can be envisioned. Concurrently, its intrinsic plasmonic nature synergistically combines into a single platform multi‐purpose functionalities, such as ultrasensitive detection and remote temperature readout, with practical perspectives in ultra‐compact inspection tools for structural and functional information at the nanoscale.

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Section: Resultsmentioning

confidence: 99%

Plasmon Hybridization in Compressible Metal–Insulator–Metal Nanocavities: An Optical Approach for Sensing Deep Sub‐Wavelength Deformation

Carrara

Maccaferri

Cerea

et al. 2020

Advanced Optical Materials

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“…The dynamic tunability can be further achieved using active metamaterials with electrically, optically, thermally, and chemically controllable layers. [36][37][38][39][40][41] With the ultrathin device design and the excellent tunability, our approach would pave the way toward applications of valley excitons in valley-polarized lasers and electrically excited valleytronic devices.…”

Section: Spin-dependent Contrasting Phenomena At K and K′ Valleys In mentioning

confidence: 99%

Room‐Temperature Active Modulation of Valley Dynamics in a Monolayer Semiconductor through Chiral Purcell Effects

Zhang

et al. 2019

Advanced Materials

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of free-electron spins. Such valley pseudospins feature robust spin-valley locking and direct coupling to photon spins. [3,4] As a result, excitons in monolayer semiconductors possess additional valley degrees of freedom that are directly addressable through external means, making them promising carriers for information storage and processing in valleytronic devices. [1,2,5,6] Application of valley degree of freedom in optoelectronic devices requires the capability to access and manipulate the valley behaviors. The optical selection rule (i.e., selective coupling to photons with σ + and σ − circular polarization at K and K′ valleys, respectively) in monolayer semiconductors enables the direct addressing of a specific valley by excitation using circularly polarized lasers at cryogenic temperature. The valley information can then be characterized by substantial handedness in far-field photoluminescence (PL) due to the spin conservation during recombination of valley excitons. [7,8] The incorporation of monolayer semiconductors in optical cavities with polarization-dependent responses to an incident laser can further enhance the asymmetric excitation of valley excitons and the resulting PL handedness. [9][10][11] However, the phonon-assisted intervalley scattering accelerates dramatically when temperature is increased, resulting in volatile valley states and significantly reduced handedness of far-field PL at room temperature. [8,12,13] Recent efforts have shown that near-field couplings between optical cavities and valley spins are promising in solving the cryogenic-temperature limitation and enabling room-temperature control of valley dynamics. Specifically, spin-orbit couplings between valley-polarized exciton recombination and circularly polarized surface plasmons can spatially separate the valley spins into opposite inplane directions. [14][15][16] The formation of exciton-polaritons via strong coupling between valley excitons and optical cavities can also prevent the valley polarization from complete vanishing upon enhanced intervalley scattering. [17][18][19][20][21][22] Such valley-optical cavity hybrid systems exhibited room-temperature far-field PL of maintained handedness, which would benefit the application of valley degree of freedom. [19,22] However, modulation of valley behaviors at room temperature is still limited by the requirement of precise spatial and spectral overlap between excitons and optical cavities in current approaches. In addition, it remains unclear how to distinguish the effects of spindependent excitation and near-field-controlled relaxation on Spin-dependent contrasting phenomena at K and K′ valleys in monolayer semiconductors have led to addressable valley degree of freedom, which is the cornerstone for emerging valleytronic applications in information storage and processing. Tunable and active modulation of valley dynamics in a monolayer WSe 2 is demonstrated at room temperature through controllable chiral Purcell effects in plasmonic chiral metamaterials. The strong spindependent...

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“…In our case, metamaterial strings spaced by 700 nm have been actuated independently with light of 1550 nm wavelength, demonstrating that the resolution of our optical method is determined by nanofabrication rather than diffraction. We argue that independent amplitude modulation of multiple carrier frequencies provides a route to independent optical actuation of 1D [11][12][13]22], 2D [16,23] and even 3D arrays of nanomechanical metamaterial elements with spatial resolution that is not limited by diffraction. Instead, the spatial resolution and the carrier frequencies that will drive resonant actuation are determined by the size of the nanomechanical elements.…”

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confidence: 96%

Optical addressing of nanomechanical metamaterials with subwavelength resolution

Plum

Zheludev

2018

Applied Physics Letters

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Metamaterials that offer "on-demand" control of individual metamolecules are termed "randomly accessible metamaterials". They can be useful for manipulating the wavefront of electromagnetic radiation, tailoring of the nearfield, and ultimately for multichannel data processing. Here we demonstrate how light can be used to actuate individual metamaterial elements on demand. Selectivity is achieved by constructing the metamaterial from nanomechanical elements that are designed to have slightly different mechanical resonance frequencies. Actuation is controlled by modulation of the optical control signal at the mechanical resonance frequencies of targeted elements, providing an all-optical route to randomly accessible metamaterials with spatial resolution beyond the diffraction limit.

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Nanomechanical motion transduction with a scalable localized gap plasmon architecture

Cited by 33 publications

References 31 publications

Plasmon Hybridization in Compressible Metal–Insulator–Metal Nanocavities: An Optical Approach for Sensing Deep Sub‐Wavelength Deformation

Plasmon Hybridization in Compressible Metal–Insulator–Metal Nanocavities: An Optical Approach for Sensing Deep Sub‐Wavelength Deformation

Room‐Temperature Active Modulation of Valley Dynamics in a Monolayer Semiconductor through Chiral Purcell Effects

Optical addressing of nanomechanical metamaterials with subwavelength resolution

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