Abulnaga Alex, Karg Sean, Mukherjee Sounak, Gupta Adbhut, Baldwin Kirk W, Pfeiffer Loren N, de Leon Nathalie P
Department of Electrical and Computer Engineering, Princeton University, Princeton, USA.
Nanophotonics. 2024 Nov 26;14(11):1927-1937. doi: 10.1515/nanoph-2024-0500. eCollection 2025 Jun.
Heterogeneously integrated hybrid photonic crystal cavities enable strong light-matter interactions with solid state, optically addressable quantum memories. A key challenge to realizing high quality factor () hybrid photonic crystals is the reduced index contrast on the substrate compared to suspended devices in air. This challenge is particularly acute for color centers in diamond because of diamond's high refractive index, which leads to increased scattering loss into the substrate. Here, we develop a design methodology for hybrid photonic crystals utilizing a detailed understanding of substrate-mediated loss, which incorporates sensitivity to fabrication errors as a critical parameter. Using this methodology, we design robust, high-Q, GaAs-on-diamond photonic crystal cavities, and by optimizing our fabrication procedure, we experimentally realize cavities with approaching 30,000 at a resonance wavelength of 955 nm.
异质集成的混合光子晶体腔能够实现与固态、光学可寻址量子存储器的强光-物质相互作用。实现高品质因数（）混合光子晶体的一个关键挑战是，与空气中的悬浮器件相比，衬底上的折射率对比度降低。对于金刚石中的色心而言，这一挑战尤为严峻，因为金刚石的高折射率会导致进入衬底的散射损耗增加。在此，我们基于对衬底介导损耗的详细理解，开发了一种混合光子晶体的设计方法，该方法将对制造误差的敏感性作为一个关键参数纳入其中。使用这种方法，我们设计了坚固的、高Q值的金刚石上砷化镓光子晶体腔，并且通过优化我们的制造工艺，我们在955 nm的共振波长下通过实验实现了品质因数接近30000的腔。
