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Optical Resonance in Bowtie-Shaped Nanoapertures

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We investigate the optical resonance of the near-field spectral response of bowtie-shaped nanoapertures in an aluminum film using the Finite Difference Time Domain (FDTD) computations. Pulse-Probe numerical approach is employed to obtain the near-field spectra, and resonant spectral responses are observed. The near-field distributions at resonances are analyzed to illustrate the resonant modes in the bowtie nanoaperture. The dependences of the peak wavelength and peak amplitude on the aperture size, gap size and refractive index of fill-in dielectrics are calculated. The resonant response of bowtie nanoapertures can be widely tuned and precisely engineered using nanofabrication tools. The high sensitivity of resonant response to local environment shows the great potential of bowtie nanoapertures in the use of biochemical sensing and detection.
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Keywords: BIOCHEMICAL SENSING; BOWTIE NANOAPERTURE; FDTD; RESONANCE

Document Type: Research Article

Publication date: February 1, 2008

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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