Alligator photonic crystal nanoresonators for cavity QED in diamond

Diamond photonic crystal nanobeam cavities with group-IV color-center defects have recently emerged as a versatile platform for applications in quantum networks. However, due to limitations in current diamond processing techniques, existing cavity designs rarely allow for reliable fabrication at high quality factors. “Alligator” style designs promise more scalable fabrication, high Q factors and increased noise reduction. Despite this myriad of benefits, alligator nanobeams have remained largely unexplored. In this work, we present a systematic study of these novel design templates within diamond fabrication constraints. We report simulated quality factors with Q≈2.5×10⁴ and mode volumes with V_mod∼3 (λ/n_Dia), thereby demonstrating the viability of alligator nanobeams for applications in quantum information science.