Authors:

Julio Herreros Garcia

Date Created:

Not specified

Course Title:

Professor:

Not specified

About Paper:

Cuprous oxide (Cu2O) has emerged as a promising platform for quantum photonics due to its large exciton binding energy and ability to host Rydberg excitons - highly excited states with large spatial extent and strong nonlinear interactions. These features make Cu2O ideal for studying excitonic coupling in integrated photonic structures. Our research investigates whether Rydberg excitons in Cu2O can couple effectively to on-chip waveguides, which would mark a significant step toward scalable quantum photonics devices. Using multi-layer electron beam lithography both Cu2O pillar and waveguide are embedded in custom-fabricated photonics chips. This way we can explore both resonant and non-resonant techniques at cryogenic temperatures. (~4K). Our methods include the automation of a tunable continuous-wave laser system with piezo and motor control, synchronized with wavelength meter and photodetector readouts. Spatially resolved photoluminescence measurements were conducted across the chip for assessing the optical quality of individual pillars and identifying promising coupling sites. While our results revealed strong excitonic emission from selected pillars, preliminary tests showed limited evidence of successful outcoupling from the waveguides. After a thorough investigation, new measurements yield convincing results of successful coupling and outcoupling of light. These results have laid the groundwork for future investigations in which hopefully, higher n Rydberg states can be seen. Ultimately, this study contributes foundational insights for integrating Rydberg excitons into photonic architectures and informs futures designs involving ring resonators and more advanced coupling schemes. Keywords: Photonics; Rydberg Excitons

Source:

Purdue University / 2025

Topics:

No topics listed

Co-authors:

Julio Herreros Garcia