Tight focusing of plane waves from micro-fabricated spherical mirrors

Details Tight focusing of plane waves from micro-fabricated spherical mirrors Tight focusing of plane waves from micro-fabricated spherical mirrors

2008-09-13

arxiv.org/abs/0809.2339v2

Optics Express 16, 17808 (2008)

Physics

Optics

8 pages, 5 color figures, 1 .sty file; changes made in response to referee comments; published in Optics Express

Scientific paper

10.1364/OE.16.017808

We derive a formula for the light field of a monochromatic plane wave that is truncated and reflected by a spherical mirror. Our formula is valid even for deep mirrors, where the aperture radius approaches the radius of curvature. We apply this result to micro-fabricated mirrors whose size scales are in the range of tens to hundreds of wavelengths, and show that sub-wavelength spot sizes can be achieved. This opens up the possibility of scalable arrays of tightly focused optical dipole traps without the need for high-performance optical systems.

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