3D mapping of intensity field about the focus of a micrometer scale parabolic mirror
McDonald, Alison · McConnell, Gail · Cox, David C. · Riis, Erling · Griffin, Paul F.
Original · EN
We report on the fabrication and diffraction-limited characterization of parabolic focusing micromirrors. Sub - micron beam waists are measured for mirrors with 10 μm radius aperture and measured fixed focal lengths in the range from 24 μm to 36 μm. Optical characterization of the 3D intensity in the nearfield produced when the device is illuminated with collimated light is performed using a modified confocal microscope. Results are compared directly with angular spectrum simulations, yielding strong agreement between experiment and theory, and identifying the competition between diffraction and focusing in the regime probed.
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