Wavelength-tunable focusing via a Fresnel zone microsphere.
Opt Lett
; 45(4): 852-855, 2020 Feb 15.
Article
en En
| MEDLINE
| ID: mdl-32058487
ABSTRACT
In this Letter, a novel, to the best of our knowledge, structural configuration on a transparent microsphere is proposed to engineer the focusing light field. By patterning a hybrid diffractive Fresnel zone plate structure on a partially milled microsphere using a focused ion beam, wavelength-dependent switching between mono-focal and multi-focal functionalities can be achieved. Generation of on-axis tri-foci and mono-focus light fields under high numerical-aperture (${\rm NA}\gt {0.67}$NA>0.67) conditions at two working wavelengths (405 nm and 808 nm) have been demonstrated both numerically and experimentally.
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Colección:
01-internacional
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MEDLINE
Idioma:
En
Revista:
Opt Lett
Año:
2020
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Article