Revealing Plasmonic Gap Modes in Particle-on-Film Systems Using Dark-Field Spectroscopy

Lei, Dangyuan; Fernández‐Domínguez, Antonio I.; Sonnefraud, Yannick; Appavoo, Kannatassen; Haglund, Richard F.; Pendry, J. B.; Maier, Stefan A.

doi:10.1021/nn204190e

Cited by 179 publications

(200 citation statements)

References 51 publications

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“…This geometry has previously been theoretically shown to exhibit a broadband behavior in the visible range; [ 16 ] however, a conclusive experimental realization is still lacking. [ 17 ] In this work, we demonstrate experimentally and numerically the spectral broadening that occurs in a periodic array of InSb disk dimers due to plasmonic interactions between the two disks forming each pair.…”

Section: Doi: 101002/adma201202003mentioning

confidence: 95%

Broadband Terahertz Plasmonic Response of Touching InSb Disks

et al. 2012

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The plasmonic behavior of dimers of touching semiconductor disks is studied experimentally in the difficult‐to‐realize regime where the disks are only marginally overlapping. Previous theoretical studies have shown that this geometry exhibits a highly efficient broadband response that may be very promising for light harvesting and sensing applications. By taking advantage of the plasmonic character of InSb in the terahertz regime, we experimentally confirm this broadband response and describe the associated strong field enhancement and sub‐micrometer field confinement between the disks.

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Section: Doi: 101002/adma201202003mentioning

confidence: 95%

Broadband Terahertz Plasmonic Response of Touching InSb Disks

et al. 2012

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“…In their paper, Lei et al [37] have investigated the plasmon properties of spherical gold particles nearly touching or partly embedded inside a gold film. Using numerical simulation (FEM) and dark field spectroscopy, they were able to characterize the different optical modes as a function of the incidence angle and the polarization of incident light (TE/TM) (see Figure 15A).…”

Section: Short Distance Couplingmentioning

confidence: 99%

Coupling between plasmonic films and nanostructures: from basics to applications

2015

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Plasmonic film-nanoparticles coupled systems have had a renewed interest for the past 5 years both for the richness of the provided plasmonic modes and for their high technological potential. Many groups started to investigate the optical properties of film-nanoparticles coupled systems, as to whether the spacer layer thickness is tens of nanometers thick or goes down to a few nanometers or angstroms, even reaching contact. This article reviews the recent breakthroughs in the physical understanding of such coupled systems and the different systems where nanoparticles on top of the spacer layer are either isolated/random or form regular arrays. The potential for applications, especially as perfect absorbers or transmitters is also put into evidence.

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“…Although it was believed that the broadband response of the substrate will compete with specifi city and sensitivity for SERS/SERRS, [ 30 ] the achieved EF is already comparable with periodic silver immobilized nanorod assemblies structures [ 22 ] and better than the double-resonance SERS substrates [ 23 ] due to the unique light trapping and localization feature. Intriguingly, the EF of the proposed metasurface substrate can be improved further by reducing the gap distance between NPs and the spacer thickness between top NPs and the bottom metal fi lm (e.g., [ 51,52 ] which is currently under investigation.…”

Section: Resultsmentioning

confidence: 99%

Ultrabroadband Metasurface for Efficient Light Trapping and Localization: A Universal Surface‐Enhanced Raman Spectroscopy Substrate for “All” Excitation Wavelengths

Zhang

Liu

et al. 2015

Adv Materials Inter

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nanoporous lithography methods, [18][19][20][21] etc. However, these techniques are still expensive and complicated for the fabrication of high quality SERS substrates over large areas, thus resulting in high prices for commercial SERS substrates. Furthermore, most commercial SERS substrates can only work for individual excitation wavelengths, i.e., one particular product works at one or two excitation wavelengths only. [22][23][24][25][26][27][28] When one wants to identify anonymous trace molecules or mixed samples, multiple excitation wavelengths will be required. [29][30][31] In this case, different substrates have to be used for different wavelength excitation, which consumes more biological/chemical materials, substrates, and measurement time. This is an obvious disadvantage for conventional SERS substrates. On the contrary, the SERS EF is proportional to the product of the fi eld intensity enhancements at both excitation and Raman scattering wavelengths. It was predicted that the maximum SERS enhancement can be achieved when localized surface plasmon resonance is located between the excitation and Raman scattering wavelengths. [ 32 ] To realize higher EF, double-resonance SERS substrates were proposed to realize strong enhancements for excitation and Raman scattered signals simultaneously using expensive e-beam lithography processes. [ 23 ] Due to the narrowband absorption spectra for both resonant bands, the enhanced SERS signal is still limited within narrow spectral regions. To address this problem, broadband resonant nanostructures are highly desired. For instance, a relatively broadband 1D metal-dielectric-metal metasurface (i.e., ≈70% optical absorption from 420 to 550 nm) was fabricated using e-beam lithography to realize uniform enhancement for SERS sensing. [ 24 ] However, the top-down lithography technique imposed a signifi cant fabrication cost barrier for large-scale practical applications. In addition, 1D grating structures are polarization dependent which can only work for given polarization states (usually transverse magnetic polarization). To overcome these limitations, here we report an ultrabroadband super absorbing metasurface substrate that can enhance the SERS signal for excitation wavelengths in a broad spectral region using lithography-free processes. [ 33 ] Most frequently used excitation wavelengths for SERS (e.g., from 450 to 1100 nm [23][24][25][26][27][28]34 ] are all covered due to the broadband light trapping and fi eld concentration within deep subwavelength Most reported surface-enhanced Raman spectroscopy (SERS) substrates can work for individual excitation wavelengths only. Therefore, different substrates have to be used for different excitation wavelengths, which consumes more biological/chemical materials, substrates, and measurement time. Here, an ultrabroadband super absorbing metasurface that can work as a universal substrate for low cost and high performance SERS sensing is reported. Due to broadband light trapping and localized fi eld enhancement, this structure can...

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Revealing Plasmonic Gap Modes in Particle-on-Film Systems Using Dark-Field Spectroscopy

Cited by 179 publications

References 51 publications

Broadband Terahertz Plasmonic Response of Touching InSb Disks

Broadband Terahertz Plasmonic Response of Touching InSb Disks

Coupling between plasmonic films and nanostructures: from basics to applications

Ultrabroadband Metasurface for Efficient Light Trapping and Localization: A Universal Surface‐Enhanced Raman Spectroscopy Substrate for “All” Excitation Wavelengths

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