Cuesta Francisco S, Kosulnikov Sergei, Asadchy Viktar S
Department of Electronics and Nanoengineering, Aalto University, P.O. Box 15500, FI-00076, Aalto, Finland.
Nanophotonics. 2023 Feb 20;12(6):1083-1089. doi: 10.1515/nanoph-2022-0549. eCollection 2023 Mar.
An invisible cavity is an open resonant device that confines a localized field without producing any scattering outside of the device volume. By exploiting the scatter-less property of such device, it is possible to nest two invisible cavities, as the outer cavity would simply not notice the presence of the inner one, regardless of their relative position. As a result, the position of the inner cavity becomes a means to easily control the field localized inside the cavity and its quality factor. In this paper, we discuss the properties of nested invisible cavities as a simple method to achieve stronger localized fields and high tunable quality factor. Furthermore, we show that in optics, these cavities can be implemented using nanodisk-based dielectric metasurfaces that operate near their electric resonances.
隐形腔是一种开放的谐振装置，它能限制局部场，而在装置体积之外不产生任何散射。通过利用这种装置的无散射特性，可以嵌套两个隐形腔，因为外腔根本不会注意到内腔的存在，无论它们的相对位置如何。因此，内腔的位置成为一种轻松控制腔内局部场及其品质因数的手段。在本文中，我们讨论嵌套隐形腔的特性，将其作为实现更强局部场和高可调品质因数的一种简单方法。此外，我们表明，在光学领域，这些腔可以使用基于纳米盘的介电超表面来实现，这些超表面在其电共振附近工作。
