| 摘要 |
An optical device of the present invention includes an input aperture array formed with a plurality of input apertures at a preselected period of arrangement. An output aperture array is formed with a plurality of output apertures respectively facing the input apertures at a preselected period of arrangement. An aperture array intervenes between the input aperture array and the output aperture array and is formed with apertures respectively facing the input apertures and output apertures at a preselected period of arrangement. The aperture array satisfies the following two conditions: t2>Tx(r+R)/(P+r- rho ) t1<t2x(P- rho -r)/(P+ rho -r) where T denotes a distance between the input aperture array and the output aperture array, r denotes the half-width of the input apertures, rho denotes the half-width of the output apertures, R denotes the half-width of the apertures, t1 denotes a distance between the input aperture array and the input surface of the aperture array, and t2 denotes a distance between the input aperture array and the output surface of the aperture array.
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