Angle-Dependent Spoof Surface Plasmons in Metallic Hole Arrays at Terahertz Frequencies

Bhattarai, Khagendra; Silva, Sinhara R.; Urbas, Augustine; Lee, Sang Jun; Ku, Zahyun; Zhou, Jiangfeng

doi:10.1109/jstqe.2016.2641342

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…where, n s = √ s is the refractive index of the substrate, | k sp |≈ 2πn s /λ sp , k 0 = 2π/λ, p is the period of the hole array and θ is the angle of incidence for the TM polarized light [9]. The electric field has a component along the x-axis and causes a lifting of the degeneracy of the modes propagating along the positive and negative x-directions [32]. Hence, for θ > 0, the second order diffracted mode (±1, ±1) splits into two modes (−1, ±1) and (+1, ±1).…”

Section: (A))mentioning

confidence: 99%

Enhanced infrared transmission through subwavelength hole arrays in a thin gold film mounted with dielectric micro-domes

Kumar¹,

Ramakrishna²

2018

J. Phys. D: Appl. Phys.

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Dielectric micro-domes were mounted on the subwavelength holes of a periodically perforated gold film such that a lens-like micro-dome covers each hole. In comparison to the extraordinary transmission through an array of bare holes in the gold film, this structure showed a further enhanced transmission over a larger range of incident angles with much larger bandwidth at mid-wave infrared wavelengths (m). The structure was fabricated using laser interference lithography, a novel back-exposure with an ultra-violet laser, and lift-off process that left behind the micro-domes of SU-8, covering each of the holes in the gold film. The measured transmittance of these perforated gold films, with and without the micro-domes, was verified by electromagnetic wave simulations. The enhanced transmittance arises from the scattered electromagnetic fields of the micro-domes, which couple the incident light efficiently via the scattered near-fields into the waveguide modes of holes in the plasmonic film. The increased transmittance and the highly enhanced and localized near-fields can be used to enhance the photo-response of infrared detectors over relevant bands, for example, the m band that is used for thermal imaging applications.

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Section: (A))mentioning

confidence: 99%

Enhanced infrared transmission through subwavelength hole arrays in a thin gold film mounted with dielectric micro-domes

Kumar¹,

Ramakrishna²

2018

J. Phys. D: Appl. Phys.

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“…DWELL detector performance can be enhanced by surface plasmons (SPs) caused by the inclusion of a sub‐wavelength metallic hole array (SP polaritons: SPPs) or sub‐wavelength metallic nanoparticles (localized SPs: LSPs) . SPPs are the collective oscillations of electron plasma in the metallic structure, for example, a metallic hole array, excited by electromagnetic (EM) radiation, which can concentrate light at a sub‐wavelength scale beyond the diffraction limit, thereby significantly enhancing the EM field. LSPs confine SPs in the vicinity of sub‐wavelength resonators, for example, metallic disks, which also can significantly enhance the EM field near the surface of the resonators, thereby improving the performance of the photodetectors …”

Section: Introductionmentioning

confidence: 99%

“…

Detector responsivity enhancement from integrating optimized plasmonic structure layers into quantum dot-in-a-well photodetectors is investigated by a finite integration technique-based simulation. [8][9][10][11][12] SPPs are the collective oscillations of electron plasma in the metallic structure, for example, a metallic hole array, excited by electromagnetic (EM) radiation, [13][14][15][16] which can concentrate light at a subwavelength scale beyond the diffraction limit, thereby significantly enhancing the EM field. A 0.2 µm thick gold disk-array layer improves the peak responsivity by around 15 instead.

…”

mentioning

confidence: 99%

“…[8][9][10][11][12] SPPs are the collective oscillations of electron plasma in the metallic structure, for example, a metallic hole array, excited by electromagnetic (EM) radiation, [13][14][15][16] which can concentrate light at a subwavelength scale beyond the diffraction limit, thereby significantly enhancing the EM field. [8][9][10][11][12] SPPs are the collective oscillations of electron plasma in the metallic structure, for example, a metallic hole array, excited by electromagnetic (EM) radiation, [13][14][15][16] which can concentrate light at a subwavelength scale beyond the diffraction limit, thereby significantly enhancing the EM field.…”

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confidence: 99%

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Strong Responsivity Enhancement of Quantum Dot‐in‐a‐Well Infrared Photodetectors Using Plasmonic Structures

Fowler

Kim

Lee

et al. 2018

Advcd Theory and Sims

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Detector responsivity enhancement from integrating optimized plasmonic structure layers into quantum dot-in-a-well photodetectors is investigated by a finite integration technique-based simulation. It is found that by including a 0.1 µm thick gold hole-array layer onto a backside illuminated photodetector, the peak detector responsivity is enhanced by nearly a factor of 8. A 0.2 µm thick gold disk-array layer improves the peak responsivity by around 15 instead. The calculated enhancement factors show a good agreement with experimental data by Gu et al. [1] and Lee et al. [2] Simulation method and analytical analysis accomplished in this paper provide a generalized approach to design optimal plasmonic structures integrated to various infrared detecting device configurations.high-temperature operation), [3][4][5] with those of quantum well detectors (better sensitivity and control over operating wavelength), and DWELL detectors are approaching MCTs in terms of responsivity and specificdetectivity [6,7] (although DWELL detectors still exhibit worse performance than MCTs).DWELL detector performance can be enhanced by surface plasmons (SPs) caused by the inclusion of a sub-wavelength metallic hole array (SP polaritons: SPPs) or subwavelength metallic nanoparticles (localized SPs: LSPs). [8][9][10][11][12] SPPs are the collective oscillations of electron plasma in the metallic structure, for example, a metallic hole array, excited by electromagnetic (EM) radiation, [13][14][15][16] which can concentrate light at a subwavelength scale beyond the diffraction limit, thereby significantly enhancing the EM field. LSPs confine SPs in the vicinity of sub-wavelength resonators, for example, metallic disks, which also can significantly enhance the EM field near the surface of the resonators, [17] thereby improving the performance of the photodetectors. [18][19][20]

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“…Various coupling schemes have been proposed, such as prism coupling 22 , grating coupling 23 , or a knife edge 24 , among others 25 . Spoof SPPs on periodically structured surfaces can get excited directly by an incident free space wave, as the periodicity of the structure acts to select the SPP wave vector [26][27][28][29][30] . In this work, we explore the role of a dielectric grating as a tunable coupler between a normally-incident free-space wave and THz SPPs on thin and thick InSb layers.…”

Section: Introductionmentioning

confidence: 99%

Giant THz surface plasmon polariton induced by high-index dielectric metasurface

Lin

Bhattarai

Zhou

et al. 2017

Sci Rep

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We use computational approaches to explore the role of a high-refractive-index dielectric TiO2 grating with deep subwavelength thickness on InSb as a tunable coupler for THz surface plasmons. We find a series of resonances as the grating couples a normally-incident THz wave to standing surface plasmon waves on both thin and thick InSb layers. In a marked contrast with previously-explored metallic gratings, we observe the emergence of a much stronger additional resonance. The mechanism of this giant plasmonic resonance is well interpreted by the dispersion of surface plasmon excited in the air\TiO2\InSb trilayer system. We demonstrate that both the frequency and the intensity of the giant resonance can be tuned by varying dielectric grating parameters, providing more flexible tunability than metallic gratings. The phase and amplitude of the normally-incident THz wave are spatially modulated by the dielectric grating to optimize the surface plasmon excitation. The giant surface plasmon resonance gives rise to strong enhancement of the electric field above the grating structure, which can be useful in sensing and spectroscopy applications.

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Angle-Dependent Spoof Surface Plasmons in Metallic Hole Arrays at Terahertz Frequencies

Cited by 7 publications

References 17 publications

Enhanced infrared transmission through subwavelength hole arrays in a thin gold film mounted with dielectric micro-domes

Enhanced infrared transmission through subwavelength hole arrays in a thin gold film mounted with dielectric micro-domes

Strong Responsivity Enhancement of Quantum Dot‐in‐a‐Well Infrared Photodetectors Using Plasmonic Structures

Giant THz surface plasmon polariton induced by high-index dielectric metasurface

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