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AssigneeSumitomo Electric Industries, Ltd.
InventorsSoichiro Okubo, Takashi Matsuura
Estimating the term…
New material useful in miniature, low-cost Faraday rotators, polarizers (analyzers) and magnetic substances; in Faraday rotators and optical isolators that can handle a plurality of wavelengths; and in miniaturizing, and reducing the cost and enhancing the performance of, optical isolators and various optical devices. Optical isolator (60b) as one example is configured by rectilinearly arranging a wavelength-selective Faraday rotator (30), a polarizer (20) and an analyzers (40) formed from a DLC thin film, and a magnetic substance (50) that is transparent to light. Integrally forming these using thin-film lamination technology simplifies the fabrication procedure to enable manufacturing miniature, low-cost optical isolators.
A Faraday rotator having wavelength selectivity, for selectively rotating only the polarization plane of incident light of given wavelengths, the Faraday rotator comprising:
An optical isolator having wavelength selectivity, for selectively blocking return beams from incident light of given wavelengths only, the optical isolator comprising:
A polarizer lent a characteristic structure having distributed refractive indices, by irradiating with either a particle beam or an energy beam a diamond-like carbon thin film along a bias with respect to the film's thickness direction.
A diamond-like carbon thin film characterized in being transparent in the light region, and in having an extinction coefficient that is 3×10−4 or less at optical-communications wavelengths of from 1200 nm to 1700 nm.
Dependencies are inferred from the claim text.