Numerical Studies of Metal&amp;#x2013;Dielectric&amp;#x2013;Metal Nanoantennas

Joshi, Bhuwan; Chakrabarty, Ayan; Wei, Qi‐Huo

doi:10.1109/tnano.2010.2054103

Cited by 13 publications

(9 citation statements)

References 38 publications

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“…The dual pear-like pattern with strongly confined electric field (marked as the dashed blue circles in Fig. 1c) confirms the excitation of the resonant plasmon cavity mode in the gap areas between the top Au disk array and the bottom Au film [34]. The plasmon cavity modes in this kind of MDM structures can be precisely modified at the frequency region by tuning the structural parameters including the optical constants of the dielectric disks and the size of the plasmonic resonator based on the great efforts in this field by Wei et al [34,35].…”

Section: Resultssupporting

confidence: 55%

“…1c) confirms the excitation of the resonant plasmon cavity mode in the gap areas between the top Au disk array and the bottom Au film [34]. The plasmon cavity modes in this kind of MDM structures can be precisely modified at the frequency region by tuning the structural parameters including the optical constants of the dielectric disks and the size of the plasmonic resonator based on the great efforts in this field by Wei et al [34,35]. Thereby, for the absorption peak at λ=647 nm, the main contributions are the excitation of the localized plasmon resonance of the Au disks and the plasmon cavity mode of the MDM triple-layer structure [34].…”

Section: Resultssupporting

confidence: 54%

“…The plasmon cavity modes in this kind of MDM structures can be precisely modified at the frequency region by tuning the structural parameters including the optical constants of the dielectric disks and the size of the plasmonic resonator based on the great efforts in this field by Wei et al [34,35]. Thereby, for the absorption peak at λ=647 nm, the main contributions are the excitation of the localized plasmon resonance of the Au disks and the plasmon cavity mode of the MDM triple-layer structure [34]. For the former situation, enhanced field supported by the resonant plasmon of the Au disk can be efficiently affected by the surrounding medium and therefore provides application in sensing.…”

Section: Resultsmentioning

confidence: 99%

“…Further decreasing d to 50 nm, the spectral shift sensitivity of 483 nm/RIU is obtained, which only shows a slight increase comparing with that of the sensor with a d= 100 nm dielectric disk support. This mainly results from the fact that there is only a little plasmon field remained in the central area of the disk for the plasmon cavity mode [34,35].…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Resultssupporting

confidence: 55%

Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Improving Plasmon Sensing Performance by Exploiting the Spatially Confined Field

Liu

et al. 2015

Plasmonics

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show abstract

“…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]. For these MDM disks, there are two metal-dielectric interfaces and brought into close proximity.…”

Section: Theoretical Background and Modeling Structuresmentioning

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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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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Large‐Scale Laser Nanopatterning of Multiband Tunable Mid‐Infrared Metasurface Absorber

Yuan

Huang

et al. 2022

Advanced Optical Materials

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Large‐scale nanopatterning at low cost and high throughput is crucial to the practical applications of metasurfaces. Phase‐change materials equipped in these metasurfaces as modulation layers or resonators are generally applied to achieve a tunable function and have attracted significant attention. Here, an efficient method is developed by combining ultrafast laser localized modification/ablation and subsequent etching to fabricate nanostructures on a phase‐change material, Ge2Sb2Te5 (GST), over a wafer‐sized area. The localized laser treatments under gradually increased laser fluences contribute to the variety of achievable nanostructures including disk and ring structures, whose feature sizes and periods can be tuned by adjusting laser parameters and subsequent etching conditions. A mid‐infrared metasurface absorber is designed and fabricated by using the GST ring units as resonators. Notably, varying the geometrical features of rings allows generating dual‐band and tri‐band absorption peaks in the mid‐infrared spectral range, whose peak absorptivity can reach ≈92%. By converting GST from amorphous to crystalline state, a broad absorption spectral redshift of 700 nm is achieved. The large‐area high‐throughput fabrication together with high‐absorption design demonstrates their potential in mass production of phase‐change metasurface‐based absorbers.

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Numerical Studies of Metal–Dielectric–Metal Nanoantennas

Cited by 13 publications

References 38 publications

Improving Plasmon Sensing Performance by Exploiting the Spatially Confined Field

Improving Plasmon Sensing Performance by Exploiting the Spatially Confined Field

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

Large‐Scale Laser Nanopatterning of Multiband Tunable Mid‐Infrared Metasurface Absorber

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