期刊
ACS NANO
卷 6, 期 4, 页码 2931-2939出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn3001142
关键词
surface plasmon resonance; subwavelength structures; optical sensors; template stripping; nanoslit array; Fano resonance
类别
资金
- National Science Council, Taipei, Taiwan [NSC-100-2120-M-007-006, NSC-100-2221-E-001-010-MY3]
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 cm 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.
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