Visible light focusing demonstrated by plasmonic lenses based on nano-slits in an aluminum film

Optics Express
Qin Chen, David R S Cumming

Abstract

We experimentally demonstrate plasmonic lenses working in the visible range with well controlled focal lengths using nano-slits in an aluminum film. The fabricated lenses were characterized using confocal scanning optical microscopy. Two lenses with a design focal length 3 microm and 6 microm at 633 nm were investigated in detail. The full-width half-maximum beam width at the focal point was found to be 470 nm and 490 nm, and the extension of the light spot was 1.3 mum and 2.3 mum respectively. Lens performance compared extremely well with the expected behaviour from finite-difference time-domain modeling. The focal length from experiment and simulation agreed to within 3.5%. The lens manufacture was found to be insensitive to deviations from the optimum process parameters indicating that lens components can be reliably designed and produced.

References

Jun 22, 2002·Science·H J LezecT W Ebbesen
Jun 11, 2008·Optics Express·Ting XuXiangang Luo
Dec 5, 2008·Nano Letters·Lieven VerslegersShanhui Fan
Sep 5, 2005·Optics Express·Haofei ShiHongtao Gao
Mar 19, 2007·Optics Express·Daniel R MatthewsPaul Smith
Aug 6, 2009·Optics Express·M MansuripurJ V Moloney
Mar 20, 2010·Optics Letters·Lieven VerslegersShanhui Fan

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Citations

May 31, 2016·Small·Qin ChenDavid R S Cumming
Jan 26, 2012·Optics Express·Yang GaoYan Zhang
Sep 15, 2015·Optics Express·Yechuan ZhuJinshuai Diao
Aug 14, 2013·Optics Express·Iain J H McCrindleDavid R S Cumming
Jul 10, 2012·Optics Express·Soraya ZaibaPatrice L Baldeck
Sep 4, 2021·Nanoscale·Mingjie ChenQin Chen

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