Enhancing the quality factor of grating coupled plasmon resonance in optical recording media

Chakraborty, Krishnendu; Kumawat, Nityanand; Sultana, Sabiha; Varma, Manoj M.

doi:10.1016/j.sna.2016.04.025

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…The reflectance computation employs a multilayer transfer matrix approach, allowing types and thicknesses of constituents of a bimetallic layer to be optimally chosen such that the ATR reflectance dip produces the largest possible depth‐to‐width ratio at both wavelengths simultaneously, i.e., λ ex (470 nm) and λ em (525 nm) for the dye SYBR Green I . This is due to fact that the depth‐to‐width ratio is represented in proportion to the quality factor of plasmonic resonance . The enhanced quality factor indicates an increase in the plasmonic local field strength in the vicinity of the metal–dielectric interface, which elevates both the dye excitation rate and non‐radiative decay of excited dye molecules into surface plasmons (at λ em ) at an appropriate dye molecule‐metal spacing (10–100 nm) …”

Section: Resultsmentioning

confidence: 99%

Reproducible Enhancement of Fluorescence by Bimetal Mediated Surface Plasmon Coupled Emission for Highly Sensitive Quantitative Diagnosis of Double‐Stranded DNA

Tran

Lee

Yoon

et al. 2018

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Plasmonic enhancement of fluorescence from SYBR Green I conjugated with a double-stranded DNA (dsDNA) amplicon is demonstrated on polymerase chain reaction (PCR) products. Theoretical computation leads to use of the bimetallic (Au 2 nm-Ag 50 nm) surface plasmons due to larger local fields (higher quality factors) than monometallic (Ag or Au) ones at both dye excitation and emission wavelengths simultaneously, optimizing fluorescence enhancement with surface plasmon coupled emission (SPCE). Two kinds of reverse Kretschmann configurations are used, which favor, in signal-to-noise ratio, a fluorescence assay that uses optically dense buffer such as blood plasma. The fluorescence enhancement (12.9 fold at maximum) with remarkably high reproducibility (coefficient of variation (CV) < 1%) is experimentally demonstrated. This facilitates credible quantitation of enhanced fluorescence, however unlikely to obtain by localized surface plasmons. The plasmon-induced optical gain of 46 dB due to SPCE-active dye molecules is also estimated. The fluorescence enhancement technologies with PCR enables LOD of the dsDNA template concentration of ≈400 fg µL (CV < 1%), the lowest ever reported in DNA fluorescence assay to date. SPCE also reduces photobleaching significantly. These technologies can be extended for a highly reproducible and sufficiently sensitive fluorescence assay with small volumes of analytes in multiplexed diagnostics.

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Section: Resultsmentioning

confidence: 99%

Reproducible Enhancement of Fluorescence by Bimetal Mediated Surface Plasmon Coupled Emission for Highly Sensitive Quantitative Diagnosis of Double‐Stranded DNA

Tran

Lee

Yoon

et al. 2018

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“…29,[34][35][36]40 Commercially available optical discs, including compact discs (CDs), digital versatile discs (DVDs), and Blu-ray discs, which possess periodic data tracks, have been exploited as inexpensive and large-area plasmonic substrates for ultrasensitive biosensing. [41][42][43][44][45][46] We have reported a high SPR sensitivity (up to B850 nm per RIU) by using DVD-R discs. 47,48 However, the polycarbonate (PC) substrate used in manufacturing optical discs has a typical glass transition temperature (T g ) of about 147 1C, limiting the applicability and thermal stability of these sensitive SPR substrates under high-temperature conditions.…”

Section: Introductionmentioning

confidence: 97%

Outstanding surface plasmon resonance performance enabled by templated oxide gratings

Choi

Dou

Fang

et al. 2016

Phys. Chem. Chem. Phys.

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Here we report a simple and scalable soft-lithography-based templating technology for fabricating Au-covered oxide (titania and zirconia) gratings by using DVDs as a structural template. The resulting plasmonic gratings simultaneously exhibit very high surface plasmon resonance (SPR) sensitivity (up to ∼940 nm per refractive index unit, nm per RIU) and figure of merit (FOM, up to 62.5). The effects of thermal annealing of the templated oxide gratings on their final plasmonic properties have been systematically investigated by both experiments and finite-difference time-domain (FDTD) simulations. Higher SPR sensitivities and slightly reduced FOMs have been observed for the annealed gratings. Additionally, the amplitude of the SPR dips gradually decreases with increasing annealing temperatures. Scanning electron microscopy and X-ray diffraction show that the annealing process enlarges the crystal domain sizes of the oxides and smoothens the final plasmonic grating surface. Systematic FDTD simulations reveal that the SPR properties (e.g., dip amplitude) of Au-covered oxide gratings are significantly affected by the deformation of the track-pitch structure caused by thermal annealing, agreeing with the experimental results. The outstanding SPR performance combined with the high thermal stability of the crystalline oxides could make the templated plasmonic gratings a promising SPR platform for many important sensing applications, such as in situ probing heterogeneous catalytic reactions under realistic conditions.

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“…[9][10][11][12][13] Moreover, intensity modulation is suitable for constructing compact sensors for their simple structure. 14,15 However, the stability and RI detection range of intensity modulation are lower than that of other methods.…”

Section: Introductionmentioning

confidence: 99%

“…These systems rely on cylindrical lenses or rotating mirrors to analyze the angular distribution of the intensity 9 – 13 Moreover, intensity modulation is suitable for constructing compact sensors for their simple structure 14 , 15 . However, the stability and RI detection range of intensity modulation are lower than that of other methods.…”

Section: Introductionmentioning

confidence: 99%

Compact surface plasmon resonance sensor using the digital versatile disc grating as a coupler and a disperser

Wang

Cao

et al. 2023

Opt. Eng.

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Compact surface plasmon resonance (SPR) sensors are highly demanded due to their small size, low cost, and wide application scenarios compared with benchtop sensors. To realize high-precision spectral or angular analysis, most compact SPR sensors need spectrometers or rotation stages, which increase the cost of the device. We demonstrate a low-cost and compact SPR sensor by utilizing a single grating as a coupler and a disperser. The polychromatic light emitted from a light-emitting diode was coupled to surface plasmon modes by a grating made from a digital versatile disc-recordable disc. The light was dispersed by the same grating and collected by a linear charge-coupled device. The real-time detection of the SPR spectra and the resonant wavelengths was realized by homemade software based on the laboratory virtual instrument engineering workbench. By measuring different concentrations of glucose solution and sodium chloride solution, we obtain a high refractive index (RI) resolution of 5.52 × 10 −5 RI unit. This compact SPR sensor can be applied in the areas of food safety, environmental monitoring, medical diagnosis, and so on.

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Enhancing the quality factor of grating coupled plasmon resonance in optical recording media

Cited by 10 publications

References 15 publications

Reproducible Enhancement of Fluorescence by Bimetal Mediated Surface Plasmon Coupled Emission for Highly Sensitive Quantitative Diagnosis of Double‐Stranded DNA

Reproducible Enhancement of Fluorescence by Bimetal Mediated Surface Plasmon Coupled Emission for Highly Sensitive Quantitative Diagnosis of Double‐Stranded DNA

Outstanding surface plasmon resonance performance enabled by templated oxide gratings

Compact surface plasmon resonance sensor using the digital versatile disc grating as a coupler and a disperser

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