| US 7,548,678 B2 | ||
| Optical element and method for producing the same | ||
| Tomoya Sugita, Moriguchi (Japan); Kiminori Mizuuchi, Neyagawa (Japan); and Kazuhisa Yamamoto, Takatsuki (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Oct. 03, 2007, as Appl. No. 11/906,574. | ||
| Application 11/906574 is a division of application No. 10/448608, filed on May 29, 2003, granted, now 7,295,742. | ||
| Claims priority of application No. 2002-159084 (JP), filed on May 31, 2002; and application No. 2002-246527 (JP), filed on Aug. 27, 2002. | ||
| Prior Publication US 2008/0037944 A1, Feb. 14, 2008 | ||
| Int. Cl. G02B 6/10 (2006.01) | ||
| U.S. Cl. 385—129 [385/131; 385/132] | 14 Claims |
| 1. An optical element, comprising:
a base substrate;
a waveguide substrate; and
a thin film layer provided between the base substrate and the waveguide substrate, having a single-layer structure or a multilayer
structure including a film containing Ta2O5 or Nb2O5 as a principal component, wherein
the waveguide substrate is made of a crystal that is transparent with respect to light having a wavelength λ and that has
a refractive index n1 with respect to the light having the wavelength λ,
the base substrate is made of a material having a refractive index n2 with respect to the light having the wavelength λ,
the thin film layer is made of a material having a refractive index n3 with respect to the light having the wavelength λ, and has a thickness T satisfying,
when n1>n3 and n2>n3, T≠(k×λ)/(2×n3), and
when n1>n3>n2, T≠((2k−1)×λ)/(4×n3)
where n3≠n1≠n2, and k represents a natural number.
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