Optical and Thermal Design and Analysis of Phase-Change Metalenses for Active Numerical Aperture Control

被引：5

作者：

Braid, George ^{[1
]}

de Galarreta, Carlota Ruiz ^{[1
,3
]}

Comley, Andrew ^{[2
]}

Bertolotti, Jacopo ^{[1
]}

Wright, C. David ^{[1
]}

机构：

[1] Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, Devon, England

[2] AWE Aldermaston, Reading RG7 4PR, Berks, England

[3] IO CSIC, Inst Opt, Laser Proc Grp, Madrid 28006, Spain

来源：

NANOMATERIALS | 2022年 / 12卷 / 15期

基金：

英国工程与自然科学研究理事会;

关键词：

active lenses; active metasurfaces; phase-change metasurfaces; FLAT OPTICS; LASER; ABSORBERS; RESONANCE;

D O I：

10.3390/nano12152689

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The control of a lens's numerical aperture has potential applications in areas such as photography and imaging, displays, sensing, laser processing and even laser-implosion fusion. In such fields, the ability to control lens properties dynamically is of much interest, and active meta-lenses of various kinds are under investigation due to their modulation speed and compactness. However, as of yet, meta-lenses that explicitly offer dynamic control of a lens's numerical aperture have received little attention. Here, we design and simulate active meta-lenses (specifically, focusing meta-mirrors) using chalcogenide phase-change materials to provide such control. We show that, operating at a wavelength of 3000 nm, our devices can change the numerical aperture by up to a factor of 1.85 and operate at optical intensities of the order of 1.2 x 10(9) Wm(-2). Furthermore, we show the scalability of our design towards shorter wavelengths (visible spectrum), where we demonstrate a change in NA by a factor of 1.92.

引用

页数：13