Metal Nanoparticles with Gain toward Single-Molecule Detection by Surface-Enhanced Raman Scattering

Li, Zhiyuan; Xia, Younan

doi:10.1021/nl903409x

Cited by 212 publications

(224 citation statements)

References 30 publications

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“…Several groups reported that the great SERS enhancement factor led to signals at levels similar to or better than those generated from fluorescence. 27,29,33 Second, Raman produces vibrational spectral bands with narrow line widths (∼1 nm), 34 and fluorescent bands can be as wide as 50 nm; 35 thus, Raman-based probes are inherently suitable for advanced multiplex analysis. Third, the extremely short lifetimes of Raman scattering prevent photobleaching, energy transfer, or quenching of reporters in the excited state, 36 rendering high photostability to SERS tags.…”

Section: Optical Properties Of Sers Tagsmentioning

confidence: 99%

SERS Tags: Novel Optical Nanoprobes for Bioanalysis

2012

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Section: Optical Properties Of Sers Tagsmentioning

confidence: 99%

SERS Tags: Novel Optical Nanoprobes for Bioanalysis

2012

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“…The recently developed plasmon lasers showed that these dampings can be fully compensated by gain medium at the lasing state [27][28][29][30][31][32][33][34][35][36][37][38]. This intrinsic merit has great potential to enhance the performance of devices based on plasmonic resonance phenomena [39][40][41][42][43][44][45]. One example is the plasmon laser for gas phase detection where the mechanism of the sensing process relies on surface defect state modification of semiconductor material [46].…”

mentioning

confidence: 99%

Lasing Enhanced Surface Plasmon Resonance Sensing

Wang

et al. 2017

Nanophotonics

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Abstract:The resonance phenomena of surface plasmons has enabled development of a novel class of noncontact, real-time and label-free optical sensors, which have emerged as a prominent tool in biochemical sensing and detection. However, various forms of surface plasmon resonances occur with natively strong non-radiative Drude damping that weakens the resonance and limits the sensing performance fundamentally. Here we experimentally demonstrate the first lasing-enhanced surface plasmon resonance (LESPR) refractive index sensor. The figure of merit (FOM) of intensity sensing is~84,000, which is about 400 times higher than state-of-the-art surface plasmon resonance (SPR) sensor. We found that the high FOM originates from three unique features of LESPR sensors: high-quality factor, nearly zero background emission and the Gaussian-shaped lasing spectra. The LESPR sensors may form the basis for a novel class of plasmonic sensors with unprecedented performance for a broad range of applications. Keywords:Surface plasmon resonances, stimulated emission, plasmon lasers, sensors Surface plasmons are quasiparticles of coupled photons and electrons excited at the metal surface [1]. They can be tightly localised at the metal surface and thus highly sensitive to its dielectric environment. Surface plasmon sensors operate on the principle that small changes in refractive index at the vicinity of metal surface can result in a shift of surface plasmon resonance, which can be detected at optical far field, allowing non-contact, realtime and label-free sensing and detection [2][3][4][5][6]. In the past two decades, the surface plasmon resonance (SPR) sensors based on propagating surface plasmon polaritons have become a prominent tool for characterising and quantifying biomolecular interactions and are perhaps the most extensively utilised optical biosensors [3,7,8]. However, the propagating surface plasmons on flat surface cannot be directly excited due to their large momentum. In most SPR sensors, the Kretschmann configuration of attenuated total reflection is used to excite surface plasmons, which requires precise adjustment of the incident angle of the probing radiation [3,7,8]. Therefore, it remains a challenge for SPR sensors to have point-of-care performance and satisfy modern nanobiotechnology architectures [3,7,9].Localised surface plasmons (LSPs) are another type of surface plasmons that have begun to be used in sensors recently [4][5][6]. In contrast to its propagating counterpart, LSPs can be excited directly in metallic structures with dimensions less than half the wavelength. Single metal particle with tunable spectra and enhanced local field can be used for sensing, which is much more suitable for the modern nanobiotechnology architectures [9][10][11][12][13][14][15][16][17][18][19][20]. However, localised surface plasmon resonance (LSPR) sensors are with orders of magnitude lower sensitivity compared with propagating SPR sensors [8,13]. Only when measuring refractive index change in the nanometer vicinity to the meta...

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“…The lower noise-signal ratio may be the result of the larger absorption loss for gold material in the near infrared, the higher absorption loss produces much quicker decay in surface plasmon resonance and shorter life expectancy. As the electric field strength is proportional to the accumulation of incident energy, shorter life means the shorter accumulation time, less energy, lower intensity [9], and the local electric field and SERS enhancement factor is also small, which means weaker Raman signals. …”

Section: Resultsmentioning

confidence: 99%

Optical Properties of Thin Gold Nanoshell Arrays and Their Application as NIR SERS Substrate

Liu¹,

Zhang²

2017

dteees

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Abstract. The metallic hollow-core nanoshell arrays were fabricated by depositing relatively thin gold films onto a cleaned silicon support covered with a close-packed monolayer of 200 nm diameter polystyrene spheres and then removing the spheres. The relationship between their morphologies and optical properties was discussed. Then, the surface enhanced Raman scattering signals of 4-aminothiophenol (4-ATP) molecules adsorbed on the nanoshell arrays were obtained with the excitation wavelength of 785 nm and 1064nm, respectively. The results show that the localized surface plasmon resonance wavelength of gold nanoshell arrays can be precisely tuned over a wide range from visible region to infrared region by controlling the shell thickness of the nanoshell arrays, as the shell thickness increases, the resonance wavelength red shifts and the spectrum width broadens due to the electric field coupling effect among the nanoshell particles, the surface enhanced Raman scattering signals can be obtained obviously at two different infrared wavelengths of 785nm and 1064nm, indicating that the fabricated nanoshell arrays can be used as the potential low-cost surface enhanced Raman scattering substrates.

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Metal Nanoparticles with Gain toward Single-Molecule Detection by Surface-Enhanced Raman Scattering

Cited by 212 publications

References 30 publications

SERS Tags: Novel Optical Nanoprobes for Bioanalysis

SERS Tags: Novel Optical Nanoprobes for Bioanalysis

Lasing Enhanced Surface Plasmon Resonance Sensing

Optical Properties of Thin Gold Nanoshell Arrays and Their Application as NIR SERS Substrate

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