Evanescent field-assisted intensity modulation of surface-enhanced Raman scattering from a single plasmonic nanowire

Polali, Sruthi; Singh, Danveer; Kumar, G. V. Pavan

doi:10.1088/0022-3727/46/19/195107

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…The operational wavelength (633 nm) falls near to resonance in the broad scattering spectrum of the NW. 36 The first diffracted order from SLM was filtered and sent to a microscopic objective (0.50 NA, 50×) as a Gaussian, LG, or HG beam for the illumination of individual NW. Forward scattered light was captured with a high numerical aperture objective lens (1.49 NA, 100×).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…SLM modulates the phase of the incident Gaussian beam (633 nm wavelength) from a He–Ne laser to convert it into a LG or HG beam. The operational wavelength (633 nm) falls near to resonance in the broad scattering spectrum of the NW . The first diffracted order from SLM was filtered and sent to a microscopic objective (0.50 NA, 50×) as a Gaussian, LG, or HG beam for the illumination of individual NW.…”

Section: Resultsmentioning

confidence: 99%

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Optical Orbital Angular Momentum Read-Out Using a Self-Assembled Plasmonic Nanowire

et al. 2018

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Orbital angular momentum (OAM) has emerged as an important parameter to store, control, and transport information using light. Recognizing optical beams that carry OAM at the nanoscale and their interaction with subwavelength nanostructures has turned out to be a vital task in nanophotonic signal processing and communication. The current platforms to decode information from different OAM modes are mainly based on bulk optics and requires sophisticated nanofabrication procedures. Motivated by these issues, herein we report on the utility of chemically prepared, individual plasmonic nanowire for OAM read-out. Our method is based on pattern recognition of coherent light scattering from individual nanowires that can be used as direct read-outs of two parameters of an OAM beam: magnitude of topological charge and its sign. All the experimental observations related to pattern formation are corroborated by three-dimensional numerical simulations. Given that pattern formation and recognition are exhaustively utilized in various computational domains, we envisage that our results can be interfaced with machine-learning methods, wherein direct read-out of OAM signals can be performed without human intervention. Such methods may have a direct implication on chip-scale robotics and chiral nanophotonic interfaces.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Optical Orbital Angular Momentum Read-Out Using a Self-Assembled Plasmonic Nanowire

et al. 2018

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“…Since the electric field of an evanescent-wave optical illumination decays exponentially from the interface, it is very sensitive in probing the emission of light from chromophores adsorbed on the surface and interfaces. Recently, an evanescent-wave Raman/photoluminescent microscope was successfully used to probe meso- and nanostructures with total-internal reflected light . In Figure we show the data on live PL imaging of the G-Py system by using an evanescent field setup .…”

Section: Resultsmentioning

confidence: 99%

“…Recently, an evanescent-wave Raman/ photoluminescent microscope was successfully used to probe meso-and nanostructures with total-internal reflected light. 49 In Figure 2 we show the data on live PL imaging of the G-Py system by using an evanescent field setup. 48 A drop of the gelforming mixture (G-Py) was cast on a thin glass coverslip and in a few minutes the sol subsequently turned into a gel under ambient conditions.…”

Section: Resultsmentioning

confidence: 99%

Redox-Induced Photoluminescence of Metal–Organic Coordination Polymer Gel

et al. 2014

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In this study, we have prepared a redox-active and intrinsically nonphotoluminescent metal−organic gel comprised of iron ions and terephthalic acid. In the presence of small reactive organic molecules like pyrrole, aniline, and bithiophene, the gelation process was unaffected and at the same time it led to the formation of highly photoluminescent hybrid materials. The photoluminescence turn-on response was primarily attributed to the redox reaction between iron ions and the small organic molecules generating oxidized oligomers in the porous gel matrix. A remarkable morphological transformation of the metal−organic gel from spindle-like to nanofibers, induced by the redox reaction, was detected. The adopted synthetic approach is very simple and the ease of tailor-making photoluminescence in the materials by varying the combinations of redox system and reactive small organic molecule will open up new perspective in the field of coordination polymers, specifically, for sensors, photonics, and photovoltaic applications.

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“…Ritchie et al [2] gave the theory that nonradiative SPWs exist at the bound ary in the terms of the dielectric constant. The coupling of a high power laser with a metal surface results in the generation of various nonlinear processes, for instance, surface enhanced Raman spectroscopy [3], plasmonic lasers [4], optical antennas [5], material ablation [6,7] and harmonic generations [8][9][10][11][12]. A lot of hypothetical as well as exploratory work has been done on second harmonic generation (SHG) and the results are also quite significant.…”

Section: Introductionmentioning

confidence: 99%

Enhanced third harmonic generation by a laser over a Ag and n-InSb rippled metallic surface

2018

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Electric dipole assisted third harmonic generation (THG) by a CO 2 laser over a rippled Ag and nInSb metallic surface is investigated theoretically. The laser of frequency ω is incident over corrugated metal films using a Kretschmann attenuated total reflection technique that gives rise to electron oscillation. It exerts ponderomotive force at 2ω that couples with electron velocity at v ω to produce a nonlinear current at 3ω. Enhancement in the electric field of the third harmonic in nInSb is more than Ag by an order of two due to the high nonlinear current density. The nInSb excitation area of the third harmonic is noticed to be significantly larger than the spot size of the incident beam. The proposed scheme of surface enhanced THG provides a new avenue to upgrade nonlinear infrared spectroscopy and biomolecule imaging.

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Evanescent field-assisted intensity modulation of surface-enhanced Raman scattering from a single plasmonic nanowire

Cited by 5 publications

References 29 publications

Optical Orbital Angular Momentum Read-Out Using a Self-Assembled Plasmonic Nanowire

Optical Orbital Angular Momentum Read-Out Using a Self-Assembled Plasmonic Nanowire

Redox-Induced Photoluminescence of Metal–Organic Coordination Polymer Gel

Enhanced third harmonic generation by a laser over a Ag and n-InSb rippled metallic surface

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