Nanostructure-Mediated Launching and Detection of 2D Surface Plasmons

Day, Jared K.

doi:10.1021/nn102003c

Cited by 23 publications

(20 citation statements)

References 40 publications

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“…The GNSs acted as nanoantenna receivers that couple the incident light into SPP modes in the underlying metal lms. 47,50 The inset in Fig. 1(a) shows a transmission electron microscopy (TEM) image of GNSs (core diameter: 57 AE 9 nm; branch length: 11 AE 3 nm; bottom diameter of the branch: 18 AE 5 nm; and tip diameter of the branch: 9 AE 3 nm).…”

Section: Resultsmentioning

confidence: 99%

Tailoring surface plasmons of high-density gold nanostar assemblies on metal films for surface-enhanced Raman spectroscopy

et al. 2014

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Plasmonic systems based on metal nanoparticles on a metal film have generated great interest for surface-enhanced Raman spectroscopy (SERS) chemical sensors. In this study, we describe the fabrication of ultrasensitive SERS substrates based on high-density gold nanostar assemblies on silver films with tailored surface plasmons, where multiple field enhancements from particle-film and interparticle plasmon couplings and lightening rod effects of sharp tips of nanostars contribute to the enormous Raman enhancements. We show that the interplay between interparticle and particle-film plasmon couplings of high-density gold nanostars (GNSs) on metal and dielectric films as a function of interparticle separation can be tailored to provide maximum SERS effects. We observe that the SERS enhancement factor (EF) of GNSs on a metal film as a function of interparticle separation follows a broken power law function, where the EF increases with the interparticle separation for the strong interparticle coupling range below an interparticle separation of ~0.8 times the GNS size, but decreases for the weak interparticle coupling range (for an interparticle separation of >0.8 times the GNS size). Finally, we demonstrate the use of tailored plasmonic substrates as ultrasensitive SERS chemical sensors with an attomole level of detection capability of 2,4-dinitrotoluene, a model compound of nitroaromatic explosives.

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Section: Resultsmentioning

confidence: 99%

Tailoring surface plasmons of high-density gold nanostar assemblies on metal films for surface-enhanced Raman spectroscopy

et al. 2014

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“…With length scales below the diffraction limit, and fast operational speeds, well-designed plasmonic sensors also have potential for integration with on-chip photonic or plasmonic circuits. [ 10,11 ] To utilize a plasmonic sensor across a range of applications, the plasmon resonances must be tunable to the spectral region the Nafi on fl uoropolymer from Dupont as our spacer material. Nafi on is a poly(perfl uorosulfonic acid)-based ion-conducting membrane with a hydrophobic fl uorocarbon polymer backbone and hydrophilic sulfonic acid side chains, which allow it to take on water from its surroundings and expand signifi cantly with increasing humidity [27][28][29] (see Figure S1, Supporting Information for the chemical structure of Nafi on).…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Powell

Coles

Taylor

et al. 2016

Advanced Optical Materials

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of interest and be as sensitive as possible to small changes in the local environment. While individual particle resonances can be effectively tuned through size, shape and material choice, [ 2,12 ] coupled modes between two or more nanoparticles have been shown to exhibit far greater electric fi eld enhancements and produce more sensitive detectors. [13][14][15][16][17][18] However, these are extremely diffi cult to fabricate, with many top-down lithographic and FIBbased examples being unrealistic for scaling up, and bottom-up techniques that generally produce randomly oriented particle pairs with no control over the alignment, which is key as the resonances of such dimers are highly sensitive to the polarization of incident illumination. Henzie et al. made some important progress in this fi eld by using a gravity-driven technique to assemble nanoparticles in shallow pits in a substrate, which allows excellent control over orientation and positioning of any number of particle sets. [ 19 ] Another elegant solution to the fabrication problem is the placement of a metallic particle above a metal sheet separated by a thin spacer. A "mirror particle" is excited in the metal plane, which produces a strong coupling effect without having to align two separate particles, drastically simplifying the production process. [ 22 ] There is a growing body of work investigating the properties of silver nanocubes (NCs) above metal fi lms, to tune their scattering properties, [ 21 ] produce controlled-refl ectance surfaces, [ 22 ] and to control and enhance the radiative processes of fl uorophores within the spacer material, [ 23,24 ] as well as theoretical studies looking to build a complete description of the structure. [ 25,26 ] This system can be considered an optical patch antenna, where gap plasmon modes are supported between the metal sheet and the NC. [ 21 ] The resonant modes of these antennae are extremely sensitive to the properties of the spacer layer separating the NC and the silver sheet, and any environmental changes that infl uence the refractive index (RI), or more importantly the thickness of the chosen material will produce signifi cant changes in the plasmon resonance. As long as spacer materials which expand in response to a given analyte are available, this design can be utilized to detect any number of chemicals. This forms the basis for a new type of sensor, which can operate equally well in a gaseous or liquid setting (depending on spacer choice) and that is scalable from the sub-wavelength scale (the footprint of one nanocube) up to a large-surface area metamaterial.In this paper, we demonstrate the operation of the nanocube patch antenna system as a gas sensor for the fi rst time, usingThe ability of individual nanocube patch antennas, consisting of a silver nanocube separated from an Ag sheet by a thin fl uoropolymer spacer, to act as subwavelength sensing elements is demonstrated. An increase in relative humidity (RH) causes the spacer to expand, which alters the resonance of the plasmon cavity mode fo...

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“…Several experimental studies on the NP-scattering of SPPs have been reported [16][17][18][19][20][21][22][23][24][25], most of them based on scanning near field optical microscopy (SNOM) [16][17][18][19][20][21][22][23]. Crucial aspects such as coherence conservation and phase shifts upon SPP scattering by metal NPs have, however, rarely been probed so far.…”

Section: Introductionmentioning

confidence: 99%

Scattering of electrically excited surface plasmon polaritons by gold nanoparticles studied by optical interferometry with a scanning tunneling microscope

et al. 2015

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We study the scattering of electrically excited surface plasmon polaritons (SPP) from individual nanostructures. The tunneling electrons from a scanning tunneling microscope (STM) are used to excite an outgoing , circular SPP wave on a thin (50-nm) gold film on which isolated gold nanoparticles (NPs) have been deposited. Interaction of the excited SPPs with the NPs leads to both in-plane (SPP-to-SPP) and out-of-plane (SPP-to-photon) scattering. We use SPP leakage radiation microscopy to monitor the interference between the incident and in-plane scattered SPP waves in the image plane. By changing the location of the STM tip, the distance of the pointlike SPP source to the scatterers can be varied at will, which constitutes a key advantage over other existing techniques. As well, the out-of-plane scattered radiation interferes with the direct light emission from the STM tip in the back focal plane (Fourier plane). This confirms the mutual coherence of the light and SPP emission resulting from the inelastic tunneling of an electron in the STM junction. We use this effect to demonstrate that SPP-to-photon scattering at NPs is highly directional.

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Nanostructure-Mediated Launching and Detection of 2D Surface Plasmons

Cited by 23 publications

References 40 publications

Tailoring surface plasmons of high-density gold nanostar assemblies on metal films for surface-enhanced Raman spectroscopy

Tailoring surface plasmons of high-density gold nanostar assemblies on metal films for surface-enhanced Raman spectroscopy

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Scattering of electrically excited surface plasmon polaritons by gold nanoparticles studied by optical interferometry with a scanning tunneling microscope

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