Optical properties of Er ion doped TiO2 with atomic layer deposition

Cheng Ji; Gregory D. Grant; Manish K. Singh; Sagar Seth; Koichi Tanaka; Alan M. Dibos; Supratik Guha

doi:10.1117/12.2663023

13 June 2023 Optical properties of Er ion doped TiO₂ with atomic layer deposition

Cheng Ji, Gregory D. Grant, Manish K. Singh, Sagar Seth, Koichi Tanaka, Alan M. Dibos, Supratik Guha

Proceedings Volume 12517, Quantum Information Science, Sensing, and Computation XV ; 1251702 (2023) https://doi.org/10.1117/12.2663023
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

The use of rare earth ions (REIs)—typically embedded as atomic defects in solids—has emerged as a promising strategy for practical quantum memories. In particular, the Er ion has garnered significant attention due to its telecom C-band optical transition, which makes it a suitable candidate for integration into existing optical fiber networks without the need for photon wavelength conversion. However, successful scalability of such a quantum memory platform would benefit greatly from employing a host material that is fully compatible with silicon and modern CMOS fabrication processes. In this study, we present the synthesis of Er-doped TiO₂ thin films directly on standard silicon or silicon-on-insulator (SOI) substrates using atomic layer deposition (ALD). Our thin film exhibits favorable emitter properties at cryogenic temperatures (T = 3.5 K), including a narrow inhomogeneous linewidth and optical lifetime approaching that of bulk values. Additionally, the ALD process provides ample opportunities for device fabrication and integration with other components, further enhancing its potential for practical applications. Overall, our findings suggest that Er-doped TiO₂ thin films synthesized via ALD represent a promising approach for developing practical quantum memories that can be seamlessly integrated with silicon photonics. This work lays a foundation for the development of quantum technologies with potential applications in communication, computing, and cryptography.

Conference Presentation

Citation Download Citation

Cheng Ji, Gregory D. Grant, Manish K. Singh, Sagar Seth, Koichi Tanaka, Alan M. Dibos, and Supratik Guha "Optical properties of Er ion doped TiO₂ with atomic layer deposition", Proc. SPIE 12517, Quantum Information Science, Sensing, and Computation XV , 1251702 (13 June 2023); https://doi.org/10.1117/12.2663023

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