Individual Authentication Method for Semiconductor Industry Using Optical Characteristics of Inkjet-Printed WGM-Microdisks

The distribution network for semiconductor devices has been expanding in recent years, and an accompanying problem with this expansion is the increase in damage caused by the inclusion of microcomponents that are not specified in the specifications and the illegal reuse of chips whose operation is not guaranteed. Given this context, we have been promoting the development of a framework that ensures the safety and security of the distribution network for semiconductor devices by assigning a difficult-to-counterfeit-or-copy physical ID to each semiconductor chip, and by appropriately managing and operating the ID. We used a highly accurate inkjet printing method [1] to apply micro ID patterns as a technology for applying and reading physical IDs within the aforementioned framework as the foundation for our study. From this foundation, we verified a method that utilized the unique optical features of each dot/microdisk formed by the printing as an individual ID to considerably expand its information space.