Design and characterization of a plasmonic Doppler grating for azimuthal angle-resolved surface plasmon resonances

See, Kel-Meng; Lin, F. C.; Huang, Jer‐Shing

doi:10.1039/c7nr01509g

Cited by 18 publications

(36 citation statements)

References 38 publications

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“…3d in ref. 30). In this work, the PDG index sensors contain, however, only grooves without any slit.…”

Section: Reflection Intensity Profile Fittingmentioning

confidence: 99%

“…In our previous work [ref. 30], we have demonstrated PDG-based color sorter, where the coupling between the grating resonance (narrow band) and the transmission of the slit (broad band) has led to Fano-like resonance revealed as very asymmetric transmission intensity profiles along azimuthal angle ( Fig. 3d in ref.…”

Section: Reflection Intensity Profile Fittingmentioning

confidence: 99%

“…Typically, direct excitation of SPs by free space photons is not possible because SPs possess larger in-plane momentum than the corresponding pho-tons. Several schemes have been developed to excite SPs at metal/dielectric boundaries, including Kretschmannand Otto-configurations 26,27 , nonlinear wave-mixing 28,29 and metallic gratings [30][31][32] . Among these strategies, metallic gratings have been extensively used and investigated because of their simplicity and well understood coupling mechanism.…”

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confidence: 99%

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Designable Spectrometer-Free Index Sensing Using Plasmonic Doppler Gratings

et al. 2019

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Typical nanoparticle-based plasmonic index sensors detect the spectral shift of localized surface plasmon resonance (LSPR) upon the change of environmental index. Therefore, they require broadband illumination and spectrometers. The sensitivity and flexibility of nanoparticle-based index sensors are usually limited because LSPR peaks are usually broad and the spectral position cannot be freely designed. Here, we present a fully designable index sensing platform using plasmonic Doppler gratings (PDGs), which provide broadband and azimuthal angle dependent grating periodicity. Different from LSPR sensors, PDG index sensors are based on the momentum matching between photons and surface plasmons via the lattice momentum of the grating. Therefore, index change is translated into the variation of inplane azimuthal angle for photon-to-plasmon coupling, which manifests as directly observable dark bands in the reflection image. The PDG can be freely designed to optimally match the range of index variation for specific applications. In this work, we demonstrate PDG index sensors for large (n = 1.00~1.52) and small index variation (n = 1.3330~1.3650). The tiny and nonlinear index change of water-ethanol mixture has been clearly observed and accurately quantified. Since the PDG is a dispersive device, it enables on-site and single-color index sensing without a spectrometer and provides a promising spectroscopic platform for on-chip analytical applications.

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“…3d in ref. 30). In this work, the PDG index sensors contain, however, only grooves without any slit.…”

Section: Reflection Intensity Profile Fittingmentioning

confidence: 99%

Section: Reflection Intensity Profile Fittingmentioning

confidence: 99%

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confidence: 99%

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Designable Spectrometer-Free Index Sensing Using Plasmonic Doppler Gratings

et al. 2019

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“…Last but not least, it is worth noting that the Doppler effect has wide applications in various realms including the laser cooling, [49] the tunable control of the transition frequency of semiconductor emitters, [50] and the design of plasmonic Doppler gratings for azimuthal angle resolved nanophotonic applications such as color sorters or refractive index sensors. [51,52] Then the revealed phenomenon of superlight Doppler effects in negative refractive-index systems may enrich these useful applications, as well as the exploration of non-locality in photonics and plasmonics.…”

Section: Pre-set the Value Of Their Group Velocity V G = K Sppmentioning

confidence: 99%

Normal Doppler Frequency Shift in Negative Refractive‐Index Systems

Lin

Zhang

2019

Laser & Photonics Reviews

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Besides the well‐known negative refraction, a negative refractive‐index material can exhibit another two hallmark features, which are the inverse Doppler effect and backward Cherenkov radiation. The former is known as the motion‐induced frequency shift that is contrary to the normal Doppler effect, and the latter refers to the Cherenkov radiation whose cone direction is opposite to the source's motion. Here these two features are combined and the Doppler effect inside the backward Cherenkov cone is discussed. It is revealed that the Doppler effect is not always inversed but can be normal in negative refractive‐index systems. A previously un‐reported phenomenon of normal Doppler frequency shift is proposed in a regime inside the backward Cherenkov cone, when the source's velocity is two times faster than the phase velocity of light. A realistic metal–insulator–metal structure, which supports metal plasmons with an effective negative refractive index, is adopted to demonstrate the potential realization of this phenomenon.

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“…It is well known that noble metal nanoparticles loaded onto a semiconductor surface can extend the light-harvesting scope and produce more electron-hole pairs by virtue of a strong electromagnetic field formed through surface plasmon resonance (SPR) [14][15][16]. As one of the most efficient plasmonic materials, Ag has frequently been used as a catalyst by providing chemically active sites [17].…”

Section: Introductionmentioning

confidence: 99%