METHOD FOR FORMING ALIGNMENT LAYER, LIQUID CRYSTAL OPTICAL ELEMENT, AND OPTICAL HEAD DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method for forming an alignment layer with high alignment stability by using an inorganic material and to provide a liquid crystal optical element and an optical head device excellent in optical characteristics and reliability.

SOLUTION: After an alignment layer composition containing an inorganic material having an organic group and a solvent is applied on a substrate, the alignment layer composition is heat-treated to remove the solvent. Then the alignment layer composition is obliquely irradiated with an ion beam to remove a part of the organic group to form a porous alignment layer having pores inclined with respect to the layer surface. The step of removing the solvent is preferably carried out in air at a temperature of 200°C or lower. The step of irradiating the layer with an ion beam is preferably carried out at a temperature of 300°C or lower.

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