Science· 2016Q1
Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution imaging
- 3,348citations
- Q1SCImago
- 2016year
Short summary
Researchers have fabricated metalenses using titanium dioxide metasurfaces that achieve diffraction-limited focusing at visible wavelengths (405, 532, and 660 nm) with high efficiencies (up to 86%) and enable subwavelength resolution imaging with magnifications up to 170x.
AI-generated from the title and abstract; the full text is not read.
Key points
- Fabricated metalenses with NA = 0.8 using titanium dioxide metasurfaces.
- Achieved diffraction-limited focusing at 405, 532, and 660 nm with efficiencies of 86%, 73%, and 66%, respectively.
- Demonstrated subwavelength resolution imaging with magnification up to 170x.
- Image quality comparable to state-of-the-art commercial objectives.
AI-generated from the title and abstract; the full text is not read.
Abstract
Subwavelength resolution imaging requires high numerical aperture (NA) lenses, which are bulky and expensive. Metasurfaces allow the miniaturization of conventional refractive optics into planar structures. We show that high-aspect-ratio titanium dioxide metasurfaces can be fabricated and designed as metalenses with NA = 0.8. Diffraction-limited focusing is demonstrated at wavelengths of 405, 532, and 660 nm with corresponding efficiencies of 86, 73, and 66%. The metalenses can resolve nanoscale features separated by subwavelength distances and provide magnification as high as 170×, with image qualities comparable to a state-of-the-art commercial objective. Our results firmly establish that metalenses can have widespread applications in laser-based microscopy, imaging, and spectroscopy.
The authors' abstract, as published at the source. Science, 2016 · DOI ↗
Continue with a free account
Ask the paper: 3 free questions a day about this paper; save it, get its citation, new summaries every day for your field. Takeaways are Premium.
Continue free on the webSign in with Google or Apple; no card needed. You come back to this paper.
On your phone:
Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science