Broadband asymmetric mirrors

Details Broadband asymmetric mirrors Broadband asymmetric mirrors

2011-01-25

2011-01-25

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S582000

Reexamination Certificate

active

07876503

ABSTRACT:
An asymmetric mirror is composed of a dielectric substrate [500] and a coating [502] on the dielectric substrate. Within an operational wavelength range Δλ, the mirror has a transmission symmetry ΔT=0% and a reflection asymmetry ΔR>10%, where the reflection asymmetry ΔR varies by less than 5% within the operational wavelength range Δλ. In addition, the wavelength range Δλ is substantially broad, i.e., satisfies Δλ/λmax>10%. The coating [502] is a metamaterial having structural features smaller than the smallest operational wavelength, e.g., a nano-structured metamaterial such as a photonic crystal or a disordered nano-composite of a metal and a dielectric. In a preferred embodiment, the coating [502] is semi-continuous with a filling factor p between 70% and 75%. The dielectric may be, for example, air, vacuum, an electro-optic polymer, an optical gain material, an electro-active material, or a semiconductor.

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