Holey-Metal Lenses: Sieving Single Modes with Proper Phases

Author

• Satoshi Ishii, Birck Nanotechnology Center, Purdue UniversityFollow
• Vladimir M. Shalaev, Birck Nanotechnology Center, Purdue UniversityFollow
• Alexander V. Kildishev, Birck Nanotechnology Center, Purdue UniversityFollow

Abstract

We study a planar, holey-metal lens made as a set of concentric circular arrays (rings) of nanoscale holes milled in a subwavelength-thick metal film. Each nanohole-a finite-length, circular, single-mode waveguide with a radius-dependent mode index-is used as a phase-shifting element. Our experimental results confirm that the focusing properties of our polarization-independent, holey-metal lens milled in a 380-nm-thick gold film and illuminated with 531 nm light fits the analytical model well. The proposed concept could offer an alternative to conventional refraction microlenses and open up a vital path toward on-chip or fiber-end planar photonic devices for biosensing and imaging.

Keywords

Planar lens; diffraction lens; plasmonic lens; phase control; SURFACE-PLASMONS; PHOTON-SIEVE; OPTICAL HYPERLENS; NANOSLIT LENSES; LITHOGRAPHY; FABRICATION; REFRACTION; SUPERLENS; DESIGN; LIGHT

DOI

10.1021/nl303841n

Citation

Nano Lett., 2013, 13 (1), pp 159–163 DOI: 10.1021/nl303841n

Date of this Version

1-2013

Recommended Citation

Ishii, Satoshi; Shalaev, Vladimir M.; and Kildishev, Alexander V., "Holey-Metal Lenses: Sieving Single Modes with Proper Phases" (2013). Birck and NCN Publications. Paper 1309.
http://dx.doi.org/10.1021/nl303841n