Mode evolution and nanofocusing of grating-coupled surface plasmon polaritons on metallic tip

Lu, Fanfan; Zhang, Wending; Huang, Ligang; Liang, Shuhai; Mao, Dong; Gao, Feng; Mei, Ting; Zhao, Jianlin

doi:10.29026/oea.2018.180010

Cited by 38 publications

(25 citation statements)

References 49 publications

(47 reference statements)

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“…Metallic nanostructures represent an interesting approach to bridge the gap between conventional and modern optics. Such nanostructures stimulate the oscillation of free electrons on the surface, so-called surface plasmons [5][6][7][8][9][10][11][18][19][20][21][22][23][26][27][28][29][30][31][32] that lead to strong near-field enhancements known as hot-spots that boost both linear and nonlinear characteristics 9,[33][34][35][36][37][38] . Indeed, employing surface plasmons arising at metal-dielectric boundaries allows enhancing nonlinear interactions, because electrons at the surface reside in a non-symmetric environment, where the nonlinearities arise from the asymmetry of the potential confining the electrons at the surface 2,3 .…”

Section: Metallic Nanoantennasmentioning

confidence: 99%

Nonlinear frequency conversion in optical nanoantennas and metasurfaces: materials evolution and fabrication

Rahmani¹,

Leo²,

Brener³

et al. 2018

Opto-Electronic Advances

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Nonlinear frequency conversion is one of the most fundamental processes in nonlinear optics. It has a wide range of applications in our daily lives, including novel light sources, sensing, and information processing. It is usually assumed that nonlinear frequency conversion requires large crystals that gradually accumulate a strong effect. However, the large size of nonlinear crystals is not compatible with the miniaturisation of modern photonic and optoelectronic systems. Therefore, shrinking the nonlinear structures down to the nanoscale, while keeping favourable conversion efficiencies, is of great importance for future photonics applications. In the last decade, researchers have studied the strategies for enhancing the nonlinear efficiencies at the nanoscale, e.g. by employing different nonlinear materials, resonant couplings and hybridization techniques. In this paper, we provide a compact review of the nanomaterials-based efforts, ranging from metal to dielectric and semiconductor nanostructures, including their relevant nanofabrication techniques.

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Section: Metallic Nanoantennasmentioning

confidence: 99%

Nonlinear frequency conversion in optical nanoantennas and metasurfaces: materials evolution and fabrication

Rahmani¹,

Leo²,

Brener³

et al. 2018

Opto-Electronic Advances

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“…Generally, the grating period for SPP excitation should satisfy the phase-matching condition k sp = k 0 cos(α/2) ± n2π/p [38][39][40][41], where k sp is the wave vector of the SPPs (actually, k sp is dependent on the crosssectional radius of the bare tip, but here, we regard k sp as a constant at different positions due to the small change range of k sp in the grating region [38]), k 0 is the wave vector of the incident light, n is a positive integer (n = 1, 2, 3…) and ± represents the SPPs propagating upward and downward. Note that only the downward SPPs could contribute to the electric field enhancement at the tip apex.…”

Section: Spectral Responses Of Ef For Grating Parametersmentioning

confidence: 99%

Grating-assisted coupling enhancing plasmonic tip nanofocusing illuminated via radial vector beam

Zhang

et al. 2019

Nanophotonics

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Tip-enhanced Raman spectroscopy (TERS) is a very useful method to achieve label-free and super-resolution imaging, and the plasmonic tip nanofocusing plays a decisive role for TERS performance. Here, we present a method to enhance the nanofocusing characteristic of a plasmonic tip integrated in a grating near the tip apex. Simulation results show that the grating near the tip apex can significantly improve the electric field intensity of the nanofocusing field compared with a conventional bare tip, under axial excitation of a tightly focused radial vector beam. The electric field enhancement characteristic is quantified in relation with the groove number of grating, excitation wavelength, period of grating, and numerical aperture of the micro-objective (MO). These simulation results could be a good reference to fabricate a plasmonic tip for TERS applications, which is an effective way to promote the development of tip-enhanced near-field optical microscopy.

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“…Recently, the nanoimprinting or grating-coupled process to fabricate a periodic 1-D grating structure at the electrode has been demonstrated using BD-R to enhance the electric field in photoelectric conversion systems 24 . The grating-coupled technique is a prism-less, convenient, propagating SPR excitation method [25][26][27] . In the absence of SP excitation, light scattering and light trapping can occur on the grating-structured surface, improving the obtained photocurrent 28,29 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced organic solar cell performance: Multiple surface plasmon resonance and incorporation of silver nanodisks into a grating-structure electrode

Putnin

Lertvachirapaiboon

Ishikawa

et al. 2019

Opto-Electronic Advances

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In this study, plasmonic nanostructures were examined to enhance the light harvesting of organic thin-film solar cells (OSCs) by multiple surface plasmon resonance (SPR) phenomena originating from the grating-coupled configuration with a Blu-ray Disc recordable (BD-R)-imprinted aluminum (Al) grating structure and the incorporation of a series of silver nanodisks (Ag NDs). The devices with such a configuration maximize the light utilization inside OSCs via light absorption, light scattering, and trapping via multiple surface plasmon resonances. Different types and sizes of metallic nanoparticles (NPs), i.e., gold nanoparticles (Au NPs), Ag nanospheres (Ag NSs), and Ag NDs, were used, which were blended separately in a PEDOT:PSS hole transport layer (HTL). The device structure comprised of grating-imprinted-Al/P3HT:PCBM/Ag ND:PEDOT:PSS/ITO. Results obtained from the J-V curves revealed that the power conversion efficiency (PCE) of grating-structured Al/P3HT:PCBM/PEDOT:PSS/ITO is 3.16%; this value is ~6% higher than that of a flat substrate. On the other hand, devices with flat Al and incorporated Au NPs, Ag NSs, or Ag NDs in the HTL exhibited PCEs ranging from 3.15% to 3.37%. Furthermore, OSCs with an Al grating substrate were developed by the incorporation of the Ag ND series into the PEDOT:PSS layer. Compared with that of a reference device, the PCEs of the devices increased to 3.32%-3.59% (11%-20% improvement), indicating that the light absorption enhancement at the active layer corresponds to the grating-coupled surface plasmon resonance and localized surface plasmon resonance excitations with strong near-field distributions penetrating into the active layer leading to higher efficiencies and subsequent better current generation.

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Mode evolution and nanofocusing of grating-coupled surface plasmon polaritons on metallic tip

Cited by 38 publications

References 49 publications

Nonlinear frequency conversion in optical nanoantennas and metasurfaces: materials evolution and fabrication

Nonlinear frequency conversion in optical nanoantennas and metasurfaces: materials evolution and fabrication

Grating-assisted coupling enhancing plasmonic tip nanofocusing illuminated via radial vector beam

Enhanced organic solar cell performance: Multiple surface plasmon resonance and incorporation of silver nanodisks into a grating-structure electrode

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