Carrillo Santiago García-Cuevas, Alexeev Arseny M, Au Yat-Yin, Wright C David
Opt Express. 2018 Oct 1;26(20):25567-25581. doi: 10.1364/OE.26.025567.
Perfect absorber type devices are well-suited to many applications, such as solar cells, spatial light modulators, bio-sensors, and highly-sensitive photo-detectors. In such applications, a method for the design and fabrication of devices in a simple and efficient way, while at the same time maintaining design control over the key performance characteristics of resonant frequency, reflection coefficient at resonance and quality factor, would be particularly advantageous. In this work we develop such a method, based on eigenmode analysis and critical coupling theory, and apply it to the design of reconfigurable phase-change metasurface absorber devices. To validate the method, the design and fabrication of a family of absorbers was carried out with a range of 'on-demand' quality factors, all operating at the same resonant frequency and able to be fabricated simply and simultaneously on the same chip. Furthermore, by switching the phase-change layer between its amorphous and crystalline states, we show that our devices can provide an active or reconfigurable functionality.
完美吸收体类型的器件非常适合许多应用，如太阳能电池、空间光调制器、生物传感器和高灵敏度光电探测器。在这类应用中，一种以简单高效的方式设计和制造器件的方法，同时保持对共振频率、共振时的反射系数和品质因数等关键性能特征的设计控制，将具有特别的优势。在这项工作中，我们基于本征模分析和临界耦合理论开发了这样一种方法，并将其应用于可重构相变超表面吸收体器件的设计。为了验证该方法，我们制作了一系列具有不同“按需”品质因数的吸收体，它们都在相同的共振频率下工作，并且能够在同一芯片上简单且同时地制造出来。此外，通过在非晶态和晶态之间切换相变层，我们表明我们的器件可以提供有源或可重构功能。
