Photonic Crystal Optical Resonator and Method for Fabricating Same

A photonic crystal optical resonator comprising:

• a plate-like photonic crystal main body including a base part and a plurality of columnar lattice elements each having a different refractive index from that of the base part, the plurality of lattice elements being provided on the base part spaced apart in a triangular lattice at intervals not more than a wavelength of targeted light;
• and
• a light confinement portion comprising a point defect configured by a portion obtained by removing at least one of the lattice elements on respective lattice points of the photonic crystal main body;
• wherein each of six first lattice elements of the plurality of lattice elements adjacent to the light confinement portion are configured to shift from first lattice points in a direction of separating from the light confinement portion;
• wherein each of twelve second lattice elements of the plurality of lattice elements adjacent to the first lattice elements on a side of separating from the light confinement portion are configured to shift from second lattice points in the direction of separating from the light confinement portion;
• and
• wherein each of the first lattice elements has a smaller diameter than others of the plurality of lattice elements.

A method of producing a photonic crystal optical resonator, the method comprising:

• providing a plate-like photonic crystal main body including a base part and a plurality of columnar lattice elements each having a different refractive index from that of the base part, the plurality of lattice elements being provided on the base part spaced apart in a triangular lattice at intervals not more than a wavelength of targeted light;
• providing a light confinement portion comprising a point defect configured by a portion obtained by removing at least one of the lattice elements on respective lattice points of the photonic crystal main body;
• shifting each of six first lattice elements adjacent to the light confinement portion from first lattice points in a direction of separating from the light confinement portion, wherein each of the first lattice elements has a smaller diameter than others of the plurality of lattice elements;
• shifting each of twelve second lattice elements adjacent to the first lattice elements on a side of separating from the light confinement portion from second lattice points in the direction of separating from the light confinement portion;
• and
• simultaneously performing optimization of an amount of the shift of the first lattice elements, optimization of an amount of the shift of the second lattice elements, and optimization of the diameter of the first lattice elements such that a Q value of the resonator is maximized.