Abstract
A thick dielectric slab of uniform refractive index, acting as a multimode optical waveguide, can produce real optical images provided its length L is chosen so that the phase changes suffered along L by the various propagating modes differ by integer multiples of φ or of 2φ. For slab of thickness W, refractive index n, and light of wavelength λ, this condition is satisfied if L ⋍ 4 hnW 2/λ, where h = 1, 2, 3, …. The formation of the images is described theoretically and demonstrated experimentally.
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