Journal
NANOMATERIALS
Volume 12, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/nano12152689
Keywords
active lenses; active metasurfaces; phase-change metasurfaces
Categories
Funding
- UK Engineering and Physical Sciences Council (EPSRC) [EP/L015331/1]
- AWE Ltd. [CA1/RSUE/2021-00829]
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This study designs and simulates active meta-lenses that can control the numerical aperture of a lens using chalcogenide phase-change materials. Operating at a wavelength of 3000 nm, the devices can increase the numerical aperture by up to 1.85 times, and demonstrate scalability towards shorter wavelengths in the visible spectrum.
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.
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