Abstract

Using the finite-difference time-domain simulation, we show that if a gradient-index or binary planar dielectric microlens that focuses light at the output surface has a near-focus subwavelength slit the focal spot width is determined by the slit width. Notably, the slit allows the output light proportion to be increased due to the surface wave scattering, thus forming a focal spot nearly devoid of side lobes. In this work, the focal spot width of λ/23 and the diffraction efficiency of focusing of 44% are achieved.

© 2013 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Subwavelength focusing using a hyperbolic medium with a single slit

Guixin Li, Jensen Li, and Kok Wai Cheah
Appl. Opt. 50(31) G27-G30 (2011)

Subwavelength focusing of light in the planar anisotropic metamaterials with zone plates

Guowei Ren, Zhian Lai, Changtao Wang, Qin Feng, Ling Liu, Kaipeng Liu, and Xiangang Luo
Opt. Express 18(17) 18151-18157 (2010)

Light focusing at metallic annular slit structure coated with dielectric layers

Hyungduk Ko, Hyun Chul Kim, and Mosong Cheng
Appl. Opt. 49(6) 950-954 (2010)

More Recommended Articles

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription