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: | 11-九月-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 |
顯示於類別: | 期刊論文 |