標題: Efficient modulation of subwavelength focusing via meta-aperture-based plasmonic lens for multifunction applications
作者: Chang, Kai-Hao
Chen, Yen-Chun
Chang, Wen-Hao
Lee, Po-Tsung
電子物理學系
光電工程學系
Department of Electrophysics
Department of Photonics
公開日期: 11-Sep-2018
摘要: Subwavelength focusing is crucial for many applications in photonics including super-resolution micro/nanoscopy, nanolithography, and optical trapping. However, most nanostructures exhibit poor ability to modulate focusing spot, which makes them hard to achieve ultra-small resolution. Here, we propose three kinds of plasmonic lens (PL) by utilizing different meta-aperture designs for efficient subwavelength focusing modulation. The shape of nanoaperture strongly influences the diffraction properties. Spatial modulation of focusing spot by employing a circular array of proposed nanoapertures is explored. The best focusing performance among these PLs is the design of T-shape nanoaperture, which has great resolution achieving ultra-small focusing spot of 0.14.2 and 0.20.2 (lambda = 633 nm) for simulation and experiment respectively, better than lots of focusing devices especially by using linear polarization. Multiple-object trapping can be realized by using T-shape nanoaperture-based PL. Our designed PLs with different nanoapertures demonstrate the capability to broaden and integrate different functionalities for on-chip nanotechnologies development.
URI: http://dx.doi.org/10.1038/s41598-018-31860-1
http://hdl.handle.net/11536/148127
ISSN: 2045-2322
DOI: 10.1038/s41598-018-31860-1
期刊: SCIENTIFIC REPORTS
Volume: 8
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