Near dispersion-less surface plasmon polariton resonances at a metal-dielectric interface with patterned dielectric on top

Kasture, Sachin; Mandal, P.; Singh, Amandev; Ramsay, Andrew J.; Vengurlekar, A. S.; Gupta, Subhasish Dutta; Belotelov, V. I.; Gopal, Achanta Venu

doi:10.1063/1.4749277

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…3(b) . Sparse k-space and dispersive modes are already reported in square lattice patterns with period around 0.7 µm 38 .…”

Section: Discussionmentioning

confidence: 90%

“…In order to calculate the grating excited SPP modes one can equate the 2-d momentum conservation equation where appropriate k SPP is used depending on the layer structure. For example, for 2-d pattern of air holes 38 , where a 1 and a 2 are the periods in x and y directions, respectively. Compared to a periodic crystal, the azimuthal angle (φ) dependence in a quasicrystal is negligible due to rotational symmetry.…”

Section: Discussionmentioning

confidence: 99%

“…1d for K II compared to K I . The resonance (k I ,A,0,1), is a near dispersionless mode 36 for φ = 0°. Figure 2a shows the measurement geometry.…”

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confidence: 99%

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confidence: 99%

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Plasmonic quasicrystals with broadband transmission enhancement

Kasture

Ravishankar

Yallapragada

et al. 2014

Sci Rep

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Plasmonic quasicrystals (PlQCs), by integrating the properties of quasicrystals (rotational symmetry and long range ordering but lack translational symmetry) and surface plasmon polariton mediated effects, offer several advantages over plasmonic crystals (PlCs). For example, in PlQCs one could have broadband, polarization independent response. However, large area patterning by electron beam lithography requires precise lattice coordinates as well as a practical way to design the structures for specific spectral response. We demonstrate design and fabrication of large area quasicrystal air hole patterns of π/5 symmetry in metal film in which broadband, polarization and launch angle independent transmission enhancement is observed. We demonstrate bi-grating quasicrystals to show that designable transmission response is possible over visible to near infrared wavelength regions with about 15 times enhancement. These would be useful in many applications like energy harvesting, nonlinear optics and quantum plasmonics.

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“…3(b) . Sparse k-space and dispersive modes are already reported in square lattice patterns with period around 0.7 µm 38 .…”

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

“…1d for K II compared to K I . The resonance (k I ,A,0,1), is a near dispersionless mode 36 for φ = 0°. Figure 2a shows the measurement geometry.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Plasmonic quasicrystals with broadband transmission enhancement

Kasture

Ravishankar

Yallapragada

et al. 2014

Sci Rep

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“…Figure 2 shows the measured dispersion for different angles . We have recently reported possibility to excite plasmon modes that are independent of the launch angle () for =0° and =90° for TM polarized incident light [16]. In Fig.…”

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Strong coupling of in-plane propagating plasmon modes and its control

Kasture¹,

Mandal²,

Gupta³

et al. 2013

Opt. Express

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:We show anti-crossings due to strong in-plane coupling of plasmon modes in dielectric-metaldielectric structure with top 2D dielectric pattern. Experimentally measured anti-crossing widths are compared with those calculated by coupled mode theory. It is shown that the coupling strength of the plasmon modes can be controlled by the orientation of the sample.Strong coupling of polariton modes results in anti-crossing or avoided crossings in the dispersion plots and are interesting for entanglement generation among others. Controlling the strength of coupling and thus the anti-crossing width or split gap between the two modes is of interest. For example, anti-crossings due to exciton-photon coupling in cavities and exciton-exciton coupling in coupled quantum dots are reported [1][2][3]. In the context of plasmons, coupled plasmons are studied where the coupling is between localized (particle) plasmons and propagating plasmons and coupling induced changes in dispersion in planar and corrugated structures [4][5][6][7]. In various sub-wavelength structures, these coupled localized and propagating plasmons are studied for basic physics as well as for different applications [8][9][10][11][12][13]. Also, in metal-dielectric-metal or dielectric-metal-dielectric structures when the middle layer is thin enough, coupling between plasmons at the top and bottom interfaces results in splitting of the modes to symmetric (short range) and anti-symmetric (long range) plasmon modes [14]. The general case of spp excitation in 1-d system when the grating vector is not contained in the plane of incidence has also been considered [15]. Such excitation geometry would allow the coupling of in-plane plasmons in case of two dimensional gratings. In this paper we report on strong coupling of in-plane propagating plasmons at the unpatterned dielectric-metal interface originating due to the 2D planar structure on the top in the non-conical excitation geometry. In addition, we show that the coupling strength and thus the anti-crossing gap (split) width can be controlled.The structure of the paper is as follows, we will first briefly describe the sample and the measurement geometry. Later, we show the experimental results on dispersion measurements which demonstrate anticrossing of plasmon modes and control of the splitting. We then quantitatively explain the splitting due to the coupling of plasmon modes followed by summary.Samples studied have dielectric-metal-dielectric layer structure with 2D air holes in dielectric pattern on top. On quartz substrates, Gold was deposited by sputtering followed by spin coating of Shipley's S1805

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Application of Plasmonics in Solar Cell Efficiency Improvement: a Brief Review on Recent Progress

Mandal

2022

Plasmonics

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Near dispersion-less surface plasmon polariton resonances at a metal-dielectric interface with patterned dielectric on top

Cited by 5 publications

References 22 publications

Plasmonic quasicrystals with broadband transmission enhancement

Plasmonic quasicrystals with broadband transmission enhancement

Strong coupling of in-plane propagating plasmon modes and its control

Application of Plasmonics in Solar Cell Efficiency Improvement: a Brief Review on Recent Progress

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