Author(s): Emeric Mudry, Eric Le Moal, Patrick Ferrand, Patrick C. Chaumet, and Anne Sentenac

Abstract:

“Focusing a light beam through a lens produces an anisotropic spot elongated along the optical axis, because the light comes from only one side of the focal point. Using the time-reversal concept, we show that isotropic focusing can be realized by placing a mirror after the focal point and shaping the incident beam. This idea is applied to confocal microscopy and brings about a dramatic improvement of the axial resolution.”

Link to Publications Page

Publication: Physical Review Letters, (subscription required)

Issue/Year/DOI: Phys. Rev. Lett., Volume 105, 203903 (2010)
doi:10.1103/PhysRevLett.105.203903