Extraordinary blueshift of a photonic crystal nanocavity by reducing its mode volume with an opaque microtip

Grosjean, Thierry; Eter, Ali El; Mivelle, Mathieu; Vo, Than-Phong; Belkhir, Abderrahmane; Ecoffey, Claude; Gac, G; Nedeljković, Dušan; Rahmani, Adel; Seassal, Christian; Callard, Ségolène; Baida, Fadi

doi:10.1063/1.4739492

Cited by 6 publications

(10 citation statements)

References 25 publications

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“…This interpretation is clearly confirmed thanks to the results of Fig. 3b obtained for off-resonant BNA and showing, similarly to reference 15 , only blueshifts whatever the distance separating the tip from the cavity. However, the quality factor of these resonances evolves differently depending on the BNA state (on or off) as it will be seen in the following.…”

Section: The Proposed Structuresupporting

confidence: 83%

“…In this case, the BNA-on-tip almost plays the role of a metallic rod as in ref. 2 leading only to a blueshift whatever the value of the distance d is as experimentally demonstrated in 15 .…”

Section: Figuresupporting

confidence: 59%

“…Larger shifts can occur for smaller tip-to-PC distances as already experimentally demonstrated in ref. 15 where 16 nm blueshift were observed for d = 10 nm . This value corresponds to an efficient tunability of the cavity resonance in comparison with the value of Δ λ = 1.7 nm that was recently obtained by focusing effect on plasmonic nanorod coupled with a PC cavity 2 .…”

Section: The Proposed Structurementioning

confidence: 86%

“…Contrarily, if we replace dielectric by metal that inhibits the light permeation, the electromagnetic field will be mostly squeezed so that the whole mode volume decreases. The direct consequence is then a blueshift of the RW 2 15 . Nonetheless, if the metallic structure exhibits localized resonance (almost with dipolar behavior), redshifts may occur after complete compensation of the mode squeezing due to the presence of the metal as already demonstrated in reference 9 .…”

mentioning

confidence: 99%

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Double-way spectral tunability for the control of optical nanocavity resonance

Baida

Grosjean

2015

Sci Rep

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Scanning Near-field Optical Microscopy (SNOM) has been successful in finely tuning the optical properties of photonic crystal (PC) nanocavities. The SNOM nanoprobes proposed so far allowed for either redshifting or blueshifting the resonance peak of the PC structures. In this paper, we theoretically demonstrate the possibility of a redshifting (up to +0.65 nm) and a blueshifting (up to −5 nm) the PC cavity resonance wavelength with a single perturbation element. As an example, a fiber bowtie-aperture nano-antenna (BNA) engraved at the apex of a SNOM tip is proposed to play this role. The double-way tunability is the result of a competition between an induced electric dipole (BNA at resonance) leading to a redshift and an induced magnetic dipole (the tip metalcoating) giving rise to a blueshift of the resonance wavelength. We demonstrate that the sign of the spectral shift can be simply controlled through the tip-to-cavity distance. This study opens the way to the full postproduction control of the resonance wavelength of high quality-factor optical cavities.

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Section: The Proposed Structuresupporting

confidence: 83%

Section: Figuresupporting

confidence: 59%

Section: The Proposed Structurementioning

confidence: 86%

mentioning

confidence: 99%

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Double-way spectral tunability for the control of optical nanocavity resonance

Baida

Grosjean

2015

Sci Rep

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“…an increasing in the optical path length -of the WGM is expected to red-shift the resonance frequency. In contrast, an anomalous blue-shift of the WGM has to be related to a decrease in the optical path length, e.g, by forcing the WGM further into the resonator [12]. This however can be achieved under certain circumstances via the boundary conditions at the surface of the dielectric substrate.…”

mentioning

confidence: 99%

Anomalous blue-shift of terahertz whispering-gallery modes via dielectric and metallic tuning

et al. 2019

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The vast majority of resonant systems show a red-shift for the resonance frequency when a perturbation, e.g. losses, are introduced to the system. In contrast, here we report for the first time the experimental demonstration of both red-and anomalous blue-shifting of whispering-gallery modes (WGMs) using dielectric and metallic substrates. The maximum blue-shift is more than three times as large as the expected red-shift, proving that the anomalous blue-shift is more than a peculiar curiosity. The experiments are performed in the terahertz (THz) frequency range with coherent continuous-wave spectroscopy. The results establish dielectric and metallic tuning as a novel, and viable approach to tune high quality (high-Q) WGMs, and provide valuable insights into the anomalous blue-shift of WGM cavity systems. The tuning capabilities for these compact monolithic resonators is of significant interest for fundamental science and technological applications alike.

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Control of the light extraction from a photonic crystal nanocavity by coupling with a nanoparticle

2022

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In this paper, we present a numerical study of the coupling between a nano-cavity, namely a Photonic Crystal Cavity (PCC) and a Nano-Particle (NP) in view of controlling the light extraction from the PCC. The main idea is to model such a near-field coupling for a NP designed to exhibit an electric dipole. We demonstrate the coupling to be very different allowing to manipulate the radiation spectrum of the whole structure in the far-field as a function of the NP position. The resonance wavelength of the PCC will be shifted toward the red region of the spectrum (up to 2 nm) while its quality factor changes dramatically according to the NP properties. This study opens the way to the development of a new kind of sources with both controllable wavelength resonance and radiation pattern.

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Extraordinary blueshift of a photonic crystal nanocavity by reducing its mode volume with an opaque microtip

Cited by 6 publications

References 25 publications

Double-way spectral tunability for the control of optical nanocavity resonance

Double-way spectral tunability for the control of optical nanocavity resonance

Anomalous blue-shift of terahertz whispering-gallery modes via dielectric and metallic tuning

Control of the light extraction from a photonic crystal nanocavity by coupling with a nanoparticle

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