Plasmonic-Enhanced Molecular Fluorescence within Isolated Bowtie Nano-Apertures

Lü, Guowei; Li, Wenqiang; Zhang, Tianyue; Yue, Song; Liu, Jie; Hou, Lei; Li, Zhi; Gong, Qihuang

doi:10.1021/nn2042412

Cited by 74 publications

(73 citation statements)

References 55 publications

(144 reference statements)

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“…The other solution is to increase the fluorescence intensity (quantum yield), and increase the photostability of existing fluorescent probes. Recent studies have demonstrated that nanometer-scale metallic structures may be the best material for this solution [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Surface plasmon‐enhanced molecular fluorescence induced by gold nanostructures

et al. 2012

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The authors report on surface plasmon-enhanced fluorescence of Eosin Y molecules induced by gold nanostructures. Al 2 O 3 films deposited by atomic layer deposition with sub-nanometer resolution were used as the spacer layer to control the distance between molecules and the gold surface. As the thickness of the Al 2 O 3 film increased, the fluorescence intensity first increased and then decreased. The highest enhancement factor is achieved with a 1 nm Al 2 O 3 film. However, the trend for the fluorescence lifetime is the opposite. It first decreased and then increased. The changes in the fluorescence quantum yield were also calculated. The yield shows a similar trend to the fluorescence intensity. The competition between the surface plasmoninduced increase in the radiative decay rate and the goldinduced fluorescence quenching is responsible for the observed phenomenon. In addition, this competition strongly depends on the thickness of the spacer layer between Eosin Y molecules and the gold surface.

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Section: Introductionmentioning

confidence: 99%

Surface plasmon‐enhanced molecular fluorescence induced by gold nanostructures

et al. 2012

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“…Figure b shows the resonant spectra of the aluminum NPs array. In terms of resonant intensity, the nanoparticles arrays show almost an order of magnitude stronger than the individual nanoparticle. Obviously, this is caused by the collective effect of the nanoparticle array.…”

Section: Resultsmentioning

confidence: 99%

Maskless Fabrication of Aluminum Nanoparticles for Plasmonic Enhancement of Lead Halide Perovskite Lasers

Wang

Fang

Zhang

et al. 2017

Advanced Optical Materials

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conventional bulk semiconductors such as GaAs. [6] Meanwhile, the emission wavelengths of lead halide perovskites can be widely tuned from ultraviolet to nearinfrared by controlling the stoichiometry either in solution during the synthesis [7] or postsynthetically with induced coupled plasma etching, [8] making them as ideal materials to fill the green gap between III-Nitrides and III-Phosphides. In the past few years, many types of lead halide perovskites lasers have been developed, e.g., Fabry-Perot lasers in perovskite nanowires, [9] whispering-gallery (WG)mode lasers in perovskite microrods and microplate, [10,11] and random lasers in selfassembled perovskite nanostructures. [12] In 2016, the main laser characteristics such as lasing wavelength, linewidths, and output directionality have been successfully improved by tailoring the cavity boundary shapes, substrates, and spatial positions. [13][14][15] However, the laser thresholds and output intensities are mostly determined by the synthesized crystal quality of lead halide perovskites. The direct enhancements of these parameters have rarely been studied.According to the Purcell effect, [16] spontaneous emission is not an intrinsic property of an emitter and it can be controlled by the surrounding electromagnetic environment. As a result, when optical materials are placed near metallic nanostructures, the total decay rate can be significantly increased owning to the large local density of optical states near the metal surface. [17] In the past decade, for the case of conventional gain materials such as GaN, [18] ZnO, [19][20][21][22] and dye-doped polymers, [23] their photoluminescence intensities and directionalities have been significantly enhanced by patterning the devices with plasmonic nanostructures, e.g., semicontinuous film, [24] metallic nanoparticles, [25] single antenna, [26] antenna array, [27] metallic nanoholes, [28] and so on. Very recently, in order to improve the optical performances of lead halide perovskite devices, a combination of lead halide perovskites and plasmonic nanostructures has proven to be very attractive. However, due to the intrinsic instability of lead halide perovskite to polar solutions, most of the nanofabrication techniques for generating nanoantennas on conventional semiconductors such as electron beam lithography and lift-off are not applicable in lead halide perovskite

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“…The plasmon gap mode was first introduced into nano-aperture antenna by Lu et al via a bowtie structure for molecule fluorescence analysis [35]. Later, the nano-aperture with plasmonic gap for molecule fluorescence analysis was further improved greatly via an antenna-in-box device by Punj et al [36] Following this strategy, we introduce the dielectric nanogap structures into the Au/Si hybrid nano-aperture to further optimize the enhancement effect.…”

Section: Resultsmentioning

confidence: 99%

Hybrid Metal-Dielectric Nano-Aperture Antenna for Surface Enhanced Fluorescence

Lü

Wen

et al. 2018

Materials

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A hybrid metal-dielectric nano-aperture antenna is proposed for surface-enhanced fluorescence applications. The nano-apertures that formed in the composite thin film consist of silicon and gold layers. These were numerically investigated in detail. The hybrid nano-aperture shows a more uniform field distribution within the apertures and a higher antenna quantum yield than pure gold nano-apertures. The spectral features of the hybrid nano-apertures are independent of the aperture size. This shows a high enhancement effect in the near-infrared region. The nano-apertures with a dielectric gap were then demonstrated theoretically for larger enhancement effects. The hybrid nano-aperture is fully adaptable to large-scale availability and reproducible fabrication. The hybrid antenna will improve the effectiveness of surface-enhanced fluorescence for applications, including sensitive biosensing and fluorescence analysis.

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Plasmonic-Enhanced Molecular Fluorescence within Isolated Bowtie Nano-Apertures

Cited by 74 publications

References 55 publications

Surface plasmon‐enhanced molecular fluorescence induced by gold nanostructures

Surface plasmon‐enhanced molecular fluorescence induced by gold nanostructures

Maskless Fabrication of Aluminum Nanoparticles for Plasmonic Enhancement of Lead Halide Perovskite Lasers

Hybrid Metal-Dielectric Nano-Aperture Antenna for Surface Enhanced Fluorescence

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