Microdisks are excellent whispering-gallery mode (WGM) optical resonators, but their emissions are invariably in-plane isotropic due to their circularities and thus difficult to be extracted efficiently. In this work, a waveguide with a width of 0.16 µm directly coupled to a microdisk with a diameter of 10 µm is fabricated on a 0.77 µm thick GaN thin film containing InGaN/GaN multi-quantum wells. This eliminates the need for precision patterning required by evanescent coupling schemes in which coupling gaps of the order of tens of nanometers must be maintained. The fabrication was carried out using nanosphere and nanowire lithography. Non-evanescent coupling of WGMs to the waveguide from the microdisk is successfully demonstrated.

中文翻译：

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具有直接耦合波导的GaN微盘，用于单向回音壁模式发射。

微型磁盘是出色的耳语画廊模式（WGM）光学谐振器，但由于其圆度，它们的发射始终是平面内各向同性的，因此很难有效提取。在这项工作中，在包含InGaN / GaN多量子阱的0.77 µm厚的GaN薄膜上制造了直接耦合到直径为10 µm的微盘的，宽度为0.16 µm的波导。这消除了消逝耦合方案所需的精确图案化的需要，在瞬逝耦合方案中，必须保持几十纳米量级的耦合间隙。使用纳米球和纳米线光刻进行制造。已成功证明了WGM的微消逝耦合到微盘的波导。