High omnidirectional reflector

Optical: systems and elements – Light interference – Produced by coating or lamina

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359359, F21V 904, G02B 110

Patent

active

061307807

ABSTRACT:
A reflector, a method of producing same and a method of creating high omnidirectional reflection for a predetermined range of frequencies of incident electromagnetic energy for any angle of incidence and any polarization. The reflector includes a structure with a surface and a refractive index variation along the direction perpendicular to the surface while remaining nearly uniform along the surface. The structure is configured such that i) a range of frequencies exists defining a photonic band gap for electromagnetic energy incident along the perpendicular direction of said surface, ii) a range of frequencies exists defining a photonic band gap for electromagnetic energy incident along a direction approximately 90.degree. from the perpendicular direction of said surface, and iii) a range of frequencies exists which is common to both of said photonic band gaps. In an exemplary embodiment, the reflector is configured as a photonic crystal.

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Baumeister, P. "The transmission and degree of polarization of quarterwave stacks at non-normal incidence." Optica Acta 8, 105-119 (1961).
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Popov, K. V. et al. "Broadband high-reflection multilayer coatings at oblique angles of incidence." Applied Optics 36, 2139-2151 (1997).

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