Planar high-numerical-aperture low-loss focusing reflectors and lenses using subwavelength high contrast gratings
- 27 May 2010
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 18 (12), 12606-12614
- https://doi.org/10.1364/oe.18.012606
Abstract
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.This publication has 11 references indexed in Scilit:
- High-Index-Contrast Grating (HCG) and Its Applications in Optoelectronic DevicesIEEE Journal of Selected Topics in Quantum Electronics, 2009
- Ultrabroadband Mirror Using Low-Index Cladded Subwavelength GratingIEEE Photonics Technology Letters, 2004
- The energy conservation law for optical two-port devicesOptics and Spectroscopy, 2002
- Binary phase Fresnel lenses for generation of two-dimensional beam arraysApplied Optics, 1991
- Laser beam lithographed micro-Fresnel lensesApplied Optics, 1990
- Blazed reflection micro-Fresnel lenses fabricated by electron-beam writing and dry developmentOptics Letters, 1990
- Blazed gratings and Fresnel lenses fabricated by electron-beam lithographyOptics Letters, 1982
- Rigorous coupled-wave analysis of planar-grating diffractionJournal of the Optical Society of America, 1981
- X-ray zone plates fabricated using electron-beam and x-ray lithographyJournal of Vacuum Science and Technology, 1979