Controlled fabrication of silver or gold nanoparticle near-field optical atomic force probes: Enhancement of second-harmonic generation

Barsegova, Inna; Lewis, Aaron; Khatchatouriants, Artium; Manevitch, Alexandra; Ignatov, A.B.; Axelrod, Noel; Sukenik, Chaim N.

doi:10.1063/1.1507618

Cited by 27 publications

(19 citation statements)

References 15 publications

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“…For example, Fischer and Pohl used a single nanoparticle on a flat metal film for plasmonic nano-imaging 32 , and Sugiura et al used an isolated metal particle as probe of a near-field fluorescence microscope in solution 33 . Barsegova et al demonstrated a fabrication of metal nanoparticles at the tip of glass fiber probe with sizecontrollable manner 36 . Barsegova et al demonstrated a fabrication of metal nanoparticles at the tip of glass fiber probe with sizecontrollable manner 36 .…”

Section: Resultsmentioning

confidence: 99%

Optical antennas with multiple plasmonic nanoparticles for tip-enhanced Raman microscopy

Taguchi

Verma

et al. 2015

Nanoscale

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Tip-enhanced Raman spectroscopy (TERS) has recently become one of the most important tools for analyzing advanced nano-devices and nano-materials, because it allows strong enhancement of weak Raman signal from the nanometric volume of a sample. However, consistent enhancement in TERS is still an issue and scientists have been struggling to fabricate good tips for reliable, strong and reproducible enhancement. There is a strong need to study the morphology and the arrangement of metal nanostructures near the tip apex for efficient plasmonic enhancement in TERS. Here, we present a study on the metal grains attached to the tip surface for producing higher and much consistent enhancement in TERS. Our study shows that the plasmonic enhancement strongly depends on the number of grains and on the their separations. We found through simulations that multiple grains arranged closely but discretely on a dielectric probe act as an efficient plasmonic antenna and that enhancement in TERS is maximum for an optimized number of grains. The number of grains and the nano-gap between them are crucial for reproducible enhancement. This promising result, which we also demonstrate and prove by experiments, will bring TERS to a new level, where it can be utilized with more confidence of large reproducible enhancement for those nano-sized samples that have extremely weak Raman scattering.

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Section: Resultsmentioning

confidence: 99%

Optical antennas with multiple plasmonic nanoparticles for tip-enhanced Raman microscopy

Taguchi

Verma

et al. 2015

Nanoscale

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“…Figure 12 shows a dark-field optical microscope image of a commercially available (Nanonics Imaging Ltd) quartz AFM tip with an Ag particle on top (the tip preparation is described in Ref. [24]), the tip being immersed into glycerol. It is clearly seen that the light scattering occurs just on the Ag particle.…”

Section: Possible Ways Of Improvement Of Signal/noise Ratio: Depolarimentioning

confidence: 99%

Optimization of tip material and shape for near‐UV TERS in Si structures

Poborchii

Tada

Kanayama

et al. 2009

J Raman Spectroscopy

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High spatial resolution stress mapping of Si device structures is in high demand throughout electronic industry. This problem can be solved by application of the tip-enhanced Raman scattering (TERS) to Si structures. This work involves searching for a suitable TERS material for the near-UV spectral range that is favorable for Raman mapping of Si structures. We show both theoretically and experimentally that Al is a good Raman enhancer at the 363.8 nm wavelength. Taking into account Raman selection rules of Si and high dielectric contrast between Si and air, we employed an inclined Al-coated Si atomic force microscope (AFM) tip that is also suitable for the top-illumination geometry of the experiment. We succeeded in detecting of a weak TERS signal of strained Si. Possible ways of improvement of the Si TERS signal/noise ratio are discussed. An Al-particle-topped AFM tip is considered as a promising solution to the problem. A prototype tip was fabricated.

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“…The two most commonly recognized TERS tips are etched metal wires and silver island films deposited on pyramidal AFM tips [58,59]. However, a single nanoparticle on the end of AFM cantilevers is also seeing increased use in TERS experiments [60,61]. Given what is known about plasmon resonances in nanoparticles and the impact on Raman enhancements, tip construction clearly plays a role in TERS signals.…”

Section: Unique Aspects Of Tersmentioning

confidence: 99%

Tip enhanced Raman scattering: plasmonic enhancements for nanoscale chemical analysis

2014

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Tip enhanced Raman scattering (TERS) is an emerging technique that uses a metalized scanning probe microscope tip to spatially localize electric fields that enhances Raman scattering enabling chemical imaging on nanometer dimensions. Arising from the same principles as surface enhanced Raman scattering (SERS), TERS offers unique advantages associated with controling the size, shape, and location of the enhancing nanostructure. In this article we discuss the correlations between current understanding of SERS and how this relates to TERS, as well as how TERS provides new understanding and insights. The relationship between plasmon resonances and Raman enhancements is emphasized as the key to obtaining optimal TERS results. Applications of TERS, including chemical analysis of carbon nanotubes, organic molecules, inorganic crystals, nucleic acids, proteins, cells and organisms, are used to illustrate the information that can be gained. Under ideal conditions TERS is capable of single molecule sensitivity and sub-nanometer spatial resolution. The ability to control plasmonic enhancements for chemical analysis suggests new experiments and opportunities to understand molecular composition and interactions on the nanoscale.

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Controlled fabrication of silver or gold nanoparticle near-field optical atomic force probes: Enhancement of second-harmonic generation

Abstract: A simple method is described for producing silver and gold nanoparticles at the tip of an atomic force microscope sensor. It is shown that these nanoparticles can enhance the nonlinear optical phenomenon of second-harmonic generation of a molecular system such as a styryl dye.

Cited by 27 publications

References 15 publications

Optical antennas with multiple plasmonic nanoparticles for tip-enhanced Raman microscopy

Optical antennas with multiple plasmonic nanoparticles for tip-enhanced Raman microscopy

Optimization of tip material and shape for near‐UV TERS in Si structures

Tip enhanced Raman scattering: plasmonic enhancements for nanoscale chemical analysis

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