Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

Xia, Juan; Tang, Jianwei; Bao, Fanglin; Sun, Yongcheng; Fang, Mingjing; Cao, Guanjun; Evans, Julian; He, Sailing

doi:10.1038/s41377-020-00398-1

Cited by 15 publications

(8 citation statements)

References 59 publications

(100 reference statements)

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“…The transmission phase (Fig. 3(e)) also implies different phase retardation for the two quasi-BIC modes of TM1 and TM2 bands, which are promising for multi-mode manipulation of optical circuits and fibers [31]. Fig.…”

Section: Resultsmentioning

confidence: 98%

Dual Quasi-Bound States in the Continuum Modes for Optical Activity Manipulation

Shen

Ren

et al. 2021

IEEE Photonics J.

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Quasi-bound states in the continuum (quasi-BIC) are a particular resonant state, which can be regulated by the degree of symmetry breaking in nanostructures. Here, we propose a fourfold rotationally symmetric (C 4v ) metasurface supporting the dual quasi-BIC modes. The Fano characteristics have observed in the near-infrared region. The resonant peaks of the dual quasi-BIC modes can be adjusted flexibly and independently with a simple breaking of the structural symmetry. More importantly, the dual quasi-BIC modes demonstrate the extraordinary capability in controlling the optical activity. This work will offer us more freedom for controlling the resonance and optical activity by the quasi-BIC modes, which is promising to engineer the optical device in displaying and optics communications.

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Section: Resultsmentioning

confidence: 98%

Dual Quasi-Bound States in the Continuum Modes for Optical Activity Manipulation

Shen

Ren

et al. 2021

IEEE Photonics J.

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“…One is using interfacial capillary forces to drive the QDs even to single limit into the nanogaps by Santhosh et al [26]. The other is taking advantage of atomic force microscopy (AFM) to manipulate single QD into the nanocavity [29,30]. Figure 5(c) shows scattering spectra of the hybrid structure with different silver nanoantenna thickness h. As the curves in Fig.…”

Section: Strong Coupling Between the Antenna And Single Qdmentioning

confidence: 99%

Strong Coupling between A Single Quantum Emitter and a Plasmonic Nanoantenna on a Metallic Film

Cao¹,

Sun²,

Liu³

et al. 2022

Preprint

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The strong coupling between individual quantum emitters and resonant optical micro/nanocavities is beneficial to understand light and matter interactions. Here we propose a plasmonic nanoantenna placed on a metal film to achieve an ultra-high electric field enhancement in the nanogap and ultra-small optical mode volume. The strong coupling between a single quantum dot and the designed structure is investigated in detail by both numerical simulations and theoretical calculations. When a single QD is inserted into the nanogap of the silver nanoantenna, scattering spectra show remarkably large spectral splitting and typical anti-crossing behavior of the vacuum Rabi splitting, which can be realized in the scattering spectra by varying the nanoantenna thickness. Our work shows a possible way to enhance light-matter interaction at a single quantum emitter limit, which can be useful for future quantum and nanophotonic applications.

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“…The phase shift introduced by the nanoantenna as it scatters light is tuneable by changing the antenna length, making it possible to enhance or practically eliminate one component of the overall electric field in one or more known locations 30 . Swappable hot and cold spots have also been demonstrated in the nanogap of two rods by changing only the polarisation of the incident field 31 . Similarly promising techniques offer ultra-fast hot spot switching between different locations near a nanostructure using Fourier limited or chirped pulses 32 , or by changing the direction of propagation of the incident light 33 .…”

Section: Introductionmentioning

confidence: 99%

Creating and moving nanoantenna cold spots anywhere

Rodríguez-Fortuño

2022

Light Sci Appl

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Cold spots are sub-wavelength regions which might emerge near a nanoantenna, should one or more components of some far-field illumination cancel out with scattered light. We show that by changing only the polarisation, amplitude, and phase of two plane waves, a unique, zero-magnitude and highly sub-wavelength cold spot can be created and moved anywhere in the space around a nanoantenna of any arbitrary shape. This can be achieved using ultra-fast modulated pulses, or a time-harmonic approximation. Easily disturbed by a change in the nanoantenna’s material or position, a manufactured cold spot is fragile and could be used in nanoscale sensing. Our technique exploits the linearity of Maxwell’s equations and could be adapted to manipulate any phenomena governed by the linear wave equation, including acoustic scattering. This is a means for potentially ultra-fast sub-wavelength electric field manipulation.

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Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

Cited by 15 publications

References 59 publications

Dual Quasi-Bound States in the Continuum Modes for Optical Activity Manipulation

Dual Quasi-Bound States in the Continuum Modes for Optical Activity Manipulation

Strong Coupling between A Single Quantum Emitter and a Plasmonic Nanoantenna on a Metallic Film

Creating and moving nanoantenna cold spots anywhere

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