A molded product having a phase separation structure formed by photopolymerization of a photopomerizable composition and imparting a sharp diffraction spot at a high diffraction efficiency, and a method for manufacturing same are provided. The molded product ( 1 ) comprises a matrix ( 2 ) and a multiple columnar structures ( 3 ) disposed within the matrix ( 2 ) and having an index of refraction different from the matrix ( 2 ), wherein the half width of a diffraction spot is 0.6° or less and diffraction efficiency is 10% or greater in an angular spectrum obtained by irradiation with a laser beam having an intensity distribution of standard normal distribution and a half width of the intensity distribution of 0.5°. The multiple columnar structures ( 3 ) are oriented in approximately the same direction, and are aligned in a regular lattice on a plane perpendicular to said orientation direction.
1. A molded product having a phase structure comprising:
a matrix and multiple columnar structures disposed within said matrix and having an index of refraction different from said matrix,
wherein the half width of a diffraction spot is 0.6° or less and diffraction efficiency is 10% or greater in an angular spectrum obtained by irradiation with a laser beam having an intensity distribution of standard normal distribution and a half width of the intensity distribution of 0.5°,
wherein the multiple columnar structures are oriented in approximately the same direction, and are aligned in a regular lattice on a plane perpendicular to said orientation direction, and
wherein the multiple columnar structures have approximately the same cross sectional shape in the direction perpendicular to the orientation direction.
2. An optical laminate comprising the molded product of claim 1 and an optically transparent film laminated thereto.
3. An optical laminate comprising the molded product of claim 1 and a glass substrate formed as a single piece with this molded product so as to support the molded product.
4. An optical low pass filter using the optical laminate of one of claims 2 and 3 .
5. An imaging optical system comprising:
a fixed image sensor and the optical low pass filter of claim 4 disposed on the photo-detection surface of this image sensor via a gap layer.