Patent ID: 9689087
Date: 2017-06-27
CPC Classifications: C30B

Claim:
1. A method of making a photonic crystal, the method comprising: step 1: providing a seed, followed by etching a surface of the seed to form thereon submicron voids; step 2: providing a graphite disk, followed by coating a side of the graphite disk with a graphite adhesive whereby the void-formed surface of the seed is attached to the graphite disk to form a seed holder; step 3: placing the seed holder above a growth chamber, followed by placing a raw material below the growth chamber; step 4: forming a thermal field in the growth chamber with a heating device to sublime the raw material by controlling the thermal field in a manner to position the seed holder at a relatively cool end of the thermal field and position the raw material at a relatively hot end of the thermal field; and step 5: controlling temperature, thermal field, atmosphere and pressure in the growth chamber to allow the gaseous raw material to be conveyed and deposited on the seed, thereby forming a photonic crystal, wherein, in step 5, the submicron voids are subjected to a locally high temperature such that crystals at the bottom of the submicron voids sublime, thereby increasing a depth of the submicron voids, and then gas molecules in the submicron voids crystallize on a surface of the graphite adhesive to seal the submicron voids hermetically, thereby finalizing formation of the submicron voids.