About Us
GLCT leverages proprietary CVD reactor designs and growth processes, drawing on CTO Dr. Timothy Grotjohn’s 35+ years of research at Michigan State University to manufacture ultra high-quality diamond substrates. GLCT’s CVD reactors are 100% designed and built in the USA, and GLCT’s diamond substrates are 100% grown in the USA.
GLCT leverages proprietary CVD reactor designs and growth processes, drawing on CTO Dr. Timothy Grotjohn’s 35+ years of research at Michigan State University to manufacture ultra high-quality diamond substrates. GLCT’s CVD reactors are 100% designed and built in the USA, and GLCT’s diamond substrates are 100% grown in the USA.

GLCT’s CTO Dr. Timothy Grotjohn is a Professor of Electrical and Computer Engineering at Michigan State University (MSU) where he works on diamond process and device R&D. He joined MSU in 1987 and served for 9 years as the Department Chairperson and for six years as the R&D Director of the Fraunhofer USA Center for Coatings and Diamond Technologies located at MSU. His current research activities include diamond deposition reactor design; diamond process R&D for doped and undoped diamond; and diamond device R&D including diodes, transistors, quantum sensors and high energy particle detectors. He holds 13 patents with 9 related to diamond synthesis and processing. He has a total of 67 journal papers and over 250 conference papers/presentations. Dr. Grotjohn received his Ph.D. in Electrical Engineering from Purdue University.
Company Leadership
Enabling Next Generation Applications
Quantum
Diamond-based quantum sensors using nitrogen-vacancy centers will unlock next-generation applications — GPS-free navigation, magnetic anomaly detection, biomedical sensing, and beyond — delivering unprecedented precision.
Advanced Packaging for AI Chips
Advanced packages for AI chips will leverage diamond’s exceptional thermal conductivity for heat extraction, radically increasing computational efficiency and chip longevity while decreasing power consumption.
High-Power Electronics
A wide band gap, high carrier saturation velocity, high dielectric strength, and the highest thermal conductivity of all materials translates to figures of merit several orders of magnitude greater than silicon, making diamond the ideal material for advanced electronics.
Durable Devices
Diamond’s exceptional durability makes it the best material for the most demanding environments — from sensing within nuclear reactors to space electronics.













