Journal ArticleDOI
Enhancing surface plasmon detection using template-stripped gold nanoslit arrays on plastic films.
Kuang-Li Lee,Pei-Wen Chen,Shu-Han Wu,Jhih-Bin Huang,Sen-Yeu Yang,Pei-Kuen Wei,Pei-Kuen Wei,Pei-Kuen Wei +7 more
TLDR
Compared to nanoslit arrays on glass substrates using electron-beam lithography, the proposed chip has a higher intensity sensitivity up to 10367%/RIU (refractive index unit) and reaches a figure of merit up to 55.5%.Abstract:
Nanostructure-based sensors are capable of sensitive and label-free detection for biomedical applications. However, high-throughput and low-cost fabrication techniques are the main issues which should be addressed. In this study, chip-based nanostructures for intensity-sensitive detection were fabricated and tested using a thermal-annealing-assisted template-stripping method. Large-area uniform nanoslit arrays with a 500 nm period and various slit widths, from 30 to 165 nm, were made on plastic films. A transverse magnetic-polarized wave in these gold nanostructures generated sharp and asymmetric Fano resonances in transmission spectra. The full width at half-maximum bandwidth decreased with the decrease of the slit width. The narrowest bandwidth was smaller than 10 nm. Compared to nanoslit arrays on glass substrates using electron-beam lithography, the proposed chip has a higher intensity sensitivity up to 10367%/RIU (refractive index unit) and reaches a figure of merit up to 55. The higher intensity sensitivity for the template-stripped nanostructure is attributed to a smoother gold surface and larger grain sizes on the plastic film, which reduces the surface plasmon propagation loss.read more
Citations
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Journal ArticleDOI
Narrowband photodetection in the near-infrared with a plasmon-induced hot electron device.
Ali Sobhani,Mark W. Knight,Yumin Wang,Bob Zheng,Nicholas S. King,Lisa V. Brown,Zheyu Fang,Peter Nordlander,Naomi J. Halas +8 more
TL;DR: A grating-based hot electron device with significantly larger photocurrent responsivity than previously reported antenna-based geometries is reported, and the grating geometry enables more than three times narrower spectral response than observed for nanoantenna-based devices.
Journal ArticleDOI
Optical Refractive Index Sensors with Plasmonic and Photonic Structures: Promising and Inconvenient Truth
Yi Xu,Yi Xu,Ping Bai,Xiaodong Zhou,Yuriy Akimov,Ching Eng Png,Lay Kee Ang,Wolfgang Knoll,Lin Wu +8 more
TL;DR: In this paper, the authors focus on optical refractive index (RI) sensors with no fluorescent labeling required, and utilize two parameters to characterize and compare the performance of optical RI sensors: sensitivity to RI change (denoted by symbol SRI) and figure of merit (in short, FoM).
Journal ArticleDOI
Towards low-cost flexible substrates for nanoplasmonic sensing
TL;DR: From the discussion in this Perspective, it is clear that highly sensitive and reproducible flexible plasmonic devices can currently be fabricated on a large scale at relatively low-cost, toward real-world applications in diagnostics and detection.
Journal ArticleDOI
Angle-Insensitive Structural Colours based on Metallic Nanocavities and Coloured Pixels beyond the Diffraction Limit
TL;DR: In this article, a color filter based on localized resonance in metallic nanoslits by light funneling was proposed, capable of wide color tunability across the entire visible band with pixel size beyond the diffraction limit.
Journal ArticleDOI
Ultrasmooth and Thermally Stable Silver-Based Thin Films with Subnanometer Roughness by Aluminum Doping
TL;DR: An approach for fabricating ultrasmooth and thermally stable Ag-based thin films on SiO2/Si substrates by Al-doping is reported, which induces ultrathin Ag films with highly stable and ultrasm smooth surface morphology.
References
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