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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 12 — Jun. 7, 2010
  • pp: 12606–12614

Planar high-numerical-aperture low-loss focusing reflectors and lenses using subwavelength high contrast gratings

Fanglu Lu, Forrest G. Sedgwick, Vadim Karagodsky, Christopher Chase, and Connie J. Chang-Hasnain  »View Author Affiliations

Optics Express, Vol. 18, Issue 12, pp. 12606-12614 (2010)

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We propose planar, high numerical aperture (NA), low loss, focusing reflectors and lenses using subwavelength high contrast gratings (HCGs). By designing the reflectance and the phase of non-periodic HCGs, both focusing reflectors and lenses can be constructed. Numerical aperture values as high as 0.81 and 0.96 are achieved for a reflector and lens with very low losses of 0.3 and 0.2 dB, respectively. The design algorithm is also shown to be readily extended to a 2D lens. Furthermore, HCG optics can simultaneously focus the reflected and transmitted waves, with important technological implications. HCG focusing optics are defined by one-step photolithography and thus can be readily integrated with many devices including VCSELs, saturable absorbers, telescopes, CCDs and solar cells.

© 2010 OSA

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(220.3630) Optical design and fabrication : Lenses

ToC Category:
Diffraction and Gratings

Original Manuscript: April 19, 2010
Revised Manuscript: May 13, 2010
Manuscript Accepted: May 14, 2010
Published: May 27, 2010

Fanglu Lu, Forrest G. Sedgwick, Vadim Karagodsky, Christopher Chase, and Connie J. Chang-Hasnain, "Planar high-numerical-aperture low-loss focusing reflectors and lenses using subwavelength high contrast gratings," Opt. Express 18, 12606-12614 (2010)

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