Slow-light effect via Rayleigh anomaly and the effect of finite gratings

Kim, Kyoung-Youm; Chong, Xinyuan; Ren, Fanghui; Wang, Alan X.

doi:10.1364/ol.40.005339

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…Thicker MOF means more adsorbed gas molecules and longer path of IR absorption. However, if the MOF layer is too thick, many more higher-order modes in the MOF layer will appear, which are very sensitive to the angular deviation of the incident light and device size. , When the incident light is not perfectly collimated or the device size is too small, the actual Q-factor will become much lower, which will reduce the field enhancement. In addition to this, thick MOF will require a much longer time to reach the equilibrium state of gas adsorption and result in slower response time .…”

Section: Resultsmentioning

confidence: 99%

Surface-Enhanced Infrared Absorption: Pushing the Frontier for On-Chip Gas Sensing

Chong¹,

Zhang²,

Li³

et al. 2018

ACS Sens.

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Surface-enhanced infrared absorption (SEIRA) is capable of identifying molecular fingerprints by resonant detection of infrared vibrational modes through the coupling with plasmonic modes of metallic nanostructures. However, SEIRA for on-chip gas sensing is still not very successful due to the intrinsically weak light-matter interaction between photons and gas molecules and the technical challenges in accumulating sufficient gas species in the vicinity of the spatially localized enhanced electric field, namely, the "hot-spots", generated through plasmonics. In this paper, we present a suspended silicon nitride (SiN) nanomembrane device by integrating plasmonic nanopatch gold antennas with metal-organic framework (MOF), which can largely adsorb carbon dioxide (CO) through its nanoporous structure. Unlike conventional SEIRA sensing relying on highly localized hot-spots of plasmonic nanoantennas or nanoparticles, the device reported in this paper engineered the coupled surface plasmon polaritons in the metal-SiN and metal-MOF interfaces to achieve strong optical field enhancement across the entire MOF film. We successfully demonstrated on-chip gas sensing of CO with more than 1800× enhancement factors by combining the concentration effect from the 2.7 μm MOF thin film and the optical field enhancement of the plasmonic nanopatch antennas.

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Section: Resultsmentioning

confidence: 99%

Surface-Enhanced Infrared Absorption: Pushing the Frontier for On-Chip Gas Sensing

Chong¹,

Zhang²,

Li³

et al. 2018

ACS Sens.

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“…The interference of the backward radiations from the periodic metallic nano-slits results in the Wood's anomaly in the glass substrate. [19] The resonant wavelength of the Wood's anomaly depends on resonant order m, refractive index of the substrate n d , and the grating period P, [20] mλ = n d P.…”

Section: Simulationmentioning

confidence: 99%

Extra-narrowband metallic filters with an ultrathin single-layer metallic grating*

2020

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Narrowband and high-transmission optical filters are extensively used in color display technology, optical information processing, and high-sensitive sensing. Because of large ohmic losses in metallic nanostructures, metallic filters usually exhibit low transmittances and broad bandwidths. By employing both strong field enhancements in metallic nano-slits and the Wood’s anomaly in a periodic metallic grating, an extra-narrowband and high-transmission metallic filter is numerically predicted in an ultrathin single-layer metallic grating. Simulation results show that the Wood’s anomaly in the ultrathin (thickness H = 60 nm) single-layer metallic grating results in large field enhancements in the substrate and low losses in the metallic grating. As a result, the transmission bandwidth (transmittance T > 60%) at λ = 1200 nm is as small as Δλ FWHM = 1.6 nm, which is smaller than 4% of that in the previous thin dielectric and metallic filters. The corresponding quality factor is as high as Q = λ/Δλ FWHM = 750, which is 40 times greater than that in the previous reports. Moreover, the thickness of our metallic filter (H = 60 nm) is smaller than 40% of that in the previous reports, and its maximum transmittance can reach up to 80%. In experiments, a narrowband metallic filter with a bandwidth of about Δλ FWHM = 10 nm, which is smaller than 25% of that in the previous metallic filters, is demonstrated.

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“…Wave-scattering by periodic media, including RW anomalous configurations, at which the quasiperiodic Green function ceases to exist, has continued to attract significant attention in the fields of optics [17,22,33,34,35,36,39,45,50] and computational electromagnetism [3,8,4,9,10,31,14,26,42,39,18]. Classical boundary integral equations methods [43,49,52] have relied on the quasi-periodic Green function (denoted throughout this work as G q κ ), which is defined in terms of a slowly converging infinite series (equation (27)).…”

Section: Introductionmentioning

confidence: 99%

On the evaluation of quasi-periodic Green functions and wave-scattering at and around Rayleigh-Wood anomalies

Bruno

Fernandez-Lado

2020

Journal of Computational Physics

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Slow-light effect via Rayleigh anomaly and the effect of finite gratings

Cited by 4 publications

References 26 publications

Surface-Enhanced Infrared Absorption: Pushing the Frontier for On-Chip Gas Sensing

Surface-Enhanced Infrared Absorption: Pushing the Frontier for On-Chip Gas Sensing

Extra-narrowband metallic filters with an ultrathin single-layer metallic grating*

On the evaluation of quasi-periodic Green functions and wave-scattering at and around Rayleigh-Wood anomalies

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