| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical filter in which wavelength selectivity is improved to a practicable degree.SOLUTION: An optical filter 10 transmits light at a predetermined wavelength and is configured to include a substrate 11, a first conductive material thin film 12 formed on the substrate 11, an opening 16 that penetrates the first conductive material thin film 12 and is arranged in a period of less than the predetermined wavelength, and a second conductive material thin film 14 at least partially opposing to the opening 16 at a given distance. |
