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1 November 2008 Dual wavelength photon sieves
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Photon sieves (PSs) are diffractive lenses with an array of pinholes that are capable of focusing light with either short, visible, or long wavelengths. PSs were fabricated using electron-beam lithography to pattern opaque silver films on a glass substrate (3 mm diam, 51.7 mm focal length). The size and spacing of pinholes was varied to create single and dual-wavelength PSs to focus 500 and/or 600 nm light, and the pinholes for the dual wavelength design were arranged in sectors, concentric with one another, or randomly. Single wavelength PSs produced focused images of a 100 μm source aperture with full width at half maximum (FWHM) of ~100 μm and high relative intensities at the design wavelength. Chromatic aberration resulted in no focused image and very low intensities when monochromatic light was 100 nm from the designed wavelength. Dual wavelength PSs produced focused images of the 100 μm source aperture with FWHMs of ~100 μm but lower relative intensities at both design wavelengths of 500 and 600 nm. The background "secondary maxima" were higher for dual wavelength designs, especially when the PS was illuminated by white light. The FWHM was smaller and the intensities higher for the random or concentric dual wavelength designs as compared to the sector design.
©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)
Hsui-Hsin Chung, Narada Bradman, Mark R. Davidson, and Paul H. Holloway "Dual wavelength photon sieves," Optical Engineering 47(11), 118001 (1 November 2008).
Published: 1 November 2008


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