<i>λ</i><sup>3</sup>/20000 plasmonic nanocavities with multispectral ultra-narrowband absorption for high-quality sensing

Liu, Zhengqi; Shao, Hui-bai; Liu, Gui-qiang; Liu, Xiaoshan; Zhou, Haiqing; Hu, Ying; Zhang, Xiang-nan; Cai, Zhengjie; Gu, Grace X.

doi:10.1063/1.4867028

Cited by 96 publications

(77 citation statements)

References 41 publications

(91 reference statements)

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“…In comparison to other existing nanocavities formed by the adjacent metallic cuboids or cylinders [16], this MDM disk array is with three advantages: (1) the dielectric spacer gap can be controlled precisely by standard deposition methods such as E-beam evaporation, (2) the metallic and dielectric disks are integrated on a single platform which can be fabricated straightforward by the topdown method, and (3) the plasmonic cavity modes (PCMs) supported by the MDM disks can be fine tuned by the geometry parameters of the disks [45]. Thanks to the great efforts made by Wei group, detailed understanding and theoretical explanation of the resonant cavity modes in these structures were presented [45][46][47].…”

Section: Theoretical Background and Modeling Structuresmentioning

confidence: 98%

“…In 2008, electromagnetic wave perfect absorber with absorption above 90 % has been achieved in a metal-dielectric-metal (MDM) triple-layer metamaterial structure [12] due to the electronic and magnetic resonances supported by the plasmonic resonators. Since then, various plasmonic light absorbers (PLAs) consisting of disks [13,14], patches [15][16][17][18], and metallic nanoparticles [19,20] were demonstrated to show near-unity light absorption. In the past decade, great attention has been focused on the achievement of broadband light absorption [18].…”

Section: Introductionmentioning

confidence: 99%

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Polarization-Induced Tunability of Plasmonic Light Absorption in Arrays of Sub-Wavelength Elliptical Disks

Liu

Wang

et al. 2015

Plasmonics

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Polarization-independent plasmonic light absorbers have been widely investigated in the past decades. Nevertheless, the feasibility for artificial manipulation of the optical properties by controlling the polarization state is desirable for numerous applications including the coloring, displaying, filtering, etc. Here, we present a straightforward method to achieve tunable multiple narrowband light absorption by using the polarization-dependent plasmonic cavity resonances in a common metal-dielectric-metal structure consisting of an elliptical disk array. Multiple light absorption bands with the maximal absorption of 98 % are achieved. Moreover, by controlling the illumination polarization state, artificial spectral modulation depth of these light absorption bands can be up to 90 % based on this structure platform. In addition, since this multispectral polarization-manipulated absorber is realized in such a common sub-wavelength plasmonic structure, it will open up a simple and universal approach for multispectral nanophotonic devices including the high-compact polychromatic color filtering, imaging, and detecting.

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Section: Theoretical Background and Modeling Structuresmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Polarization-Induced Tunability of Plasmonic Light Absorption in Arrays of Sub-Wavelength Elliptical Disks

Liu

Wang

et al. 2015

Plasmonics

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“…On the other hand, Ameling et al presented an optical cavity-enhanced plasmon sensing platform based on a dielectric microcavity coupled plasmonic nanoparticle array [24], which could produce extremely narrowed spectral bandwidth and therefore provide high FOM value to improve the sensing performance. Currently, the authors theoretically predicted a plasmonic sensing scheme with highquality factors based on the excited narrowband absorption peaks in the deep-subwavelength nanocavities, which could produce strong resonant optical field confinement [25]. Nevertheless, these different approaches generally aim at the reasonable trade-off between the structural-or shape-dependent sensitive behaviors and the fabrication difficulty of the employed nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Improving Plasmon Sensing Performance by Exploiting the Spatially Confined Field

Liu

et al. 2015

Plasmonics

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A universal method for improving sensing performance has been computationally studied based on a common triple-layer metal-dielectric-metal (MDM) plasmonic perfect absorber (PA). Calculation results show that the originally idled resonant optical field in the middle dielectric spacer can be exploited to enhance the sensing capability via etching the dielectric spacer to open a channel for analyte. By comparing with the sensitivity (S) of the common PA-based sensor, an enhancement factor up to 5.0 can be achieved for an etched PA-based sensor. Moreover, in order to maintain the mechanical stability of the structure, a modified PA-based sensor platform with a solid support for the suspended plasmonic disks array was further employed to study the sensing properties. In comparison with the referenced sensor without suspension technique, all the three sensing factors of the S, the figure of merit (FOM), and the spectral intensity difference related figure of merit (FOM*) are noticeably improved with the enhancement factors up to 2.5, 3, and 57, respectively. In addition, since there is no special dealing with the structure except the need of hollowing the dielectric spacer to open the sensing channel for the analysis, the predicted method profiles itself as a simple and universal strategy to improve the sensing performance of a wide variety of nanoplasmonic sensors.

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“…On the other hand, metalinsulator-metal (MIM) waveguides can allow optical mode volumes to be reduced to deeply subwavelength scales with minimal field decay out of the waveguide physical cross section even for frequencies far from the plasmon resonance [23]. Moreover, the interactions between two or more plasmonic structures gives rise to the hybridization of the plasmonic modes [24][25][26] and strong optical field coupling [27], which can be utilized to tune the plasmonic properties of the systems. Namely, twodimensional arrays of plasmonic rods exhibit strong near field interactions and large Purcell factor enhancement [1].…”

Section: Introductionmentioning

confidence: 99%

Near-field coupling and resonant cavity modes in plasmonic nanorod metamaterials

et al. 2016

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Plasmonic resonant cavities are capable of confining light at the nanoscale, resulting in both enhanced local electromagnetic fields and lower mode volumes. However, conventional plasmonic resonant cavities possess large Ohmic losses at metal-dielectric interfaces. Plasmonic near-field coupling plays a key role in a design of photonic components based on the resonant cavities because of a possibility to reduce losses.Here, we study the plasmonic near-field coupling in the silver nanorod metamaterials treated as resonant nanostructured optical cavities. Reflectance measurements reveal the existence of multiple resonance modes of the nanorod metamaterials being consistent with our theoretical analysis. Furthermore, our numerical simulations show that the electric field at the longitudinal resonances forms standing waves in the nanocavities due to the near-field coupling between the adjacent nanorods, and a new hybrid mode emerges due to a coupling between nanorods and a gold-film substrate. We demonstrate that this coupling can be controlled by changing a gap between the silver nanorod arrays and gold substrate.

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λ³/20000 plasmonic nanocavities with multispectral ultra-narrowband absorption for high-quality sensing

Cited by 96 publications

References 41 publications

Polarization-Induced Tunability of Plasmonic Light Absorption in Arrays of Sub-Wavelength Elliptical Disks

Polarization-Induced Tunability of Plasmonic Light Absorption in Arrays of Sub-Wavelength Elliptical Disks

Improving Plasmon Sensing Performance by Exploiting the Spatially Confined Field

Near-field coupling and resonant cavity modes in plasmonic nanorod metamaterials

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λ3/20000 plasmonic nanocavities with multispectral ultra-narrowband absorption for high-quality sensing

Cited by 96 publications

References 41 publications

Polarization-Induced Tunability of Plasmonic Light Absorption in Arrays of Sub-Wavelength Elliptical Disks

Polarization-Induced Tunability of Plasmonic Light Absorption in Arrays of Sub-Wavelength Elliptical Disks

Improving Plasmon Sensing Performance by Exploiting the Spatially Confined Field

Near-field coupling and resonant cavity modes in plasmonic nanorod metamaterials

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λ³/20000 plasmonic nanocavities with multispectral ultra-narrowband absorption for high-quality sensing