Active middle IR metamirror addressed by near IR light hologram and electric current
Vladimir Kaydashev 1, Sergey Zhukov 2, Islam Mutaev 2, Maxim Kutepov 1, Anastasya Chouprik 2;
1 Southern Federal University, Rostov-on-Don, Russia;
2 Moscow Institute of Physics and Technology, Dolgoprudny, Russia
Abstract
Novel active VO2-based metasurfaces whose THz and middle IR transmission/reflection properties are dynamically programmed due to isolator-to-metal transition (IMT) by local heating with electric current or/and laser light do provide superior advances over well established “passive” metasurfaces those properties can`t be altered after fabrication. Recently we proposed a hybrid electro-optical method to control the THz metasurface by 0.3 W/cm2 near-IR light [1].
We further develop this approach: an active VO2-based mirror to manipulate a wavefront of middle IR radiation was fabricated and characterized. A mirror made of metasurface with circular symmetry for middle IR radiation at 32 THz (9.33 micron) is homogeneously pre-heated with applied electric current and its central area of varied diameter is then programmed by projected near IR laser light hologram, i.e. it is switched between non-reflecting and highly reflecting states. Different approaches to purely electrical and combined electro-optical controlling of metasurfaces are studied. So called “pixel crosstalk”, i.e. a local parasite switching of unexposed pixels due to heat flow along the substrate was evaluated by scanning reflected middle IR wavefront at varied distances from the mirror.
Addressing of active metasurfaces with light hologram is a “new word” in dynamic programming of advanced devices for flat optics.
Research was funded by Russian Science Foundation, grant № 24-29-00175 at SFU
[1] V. Kaydashev et. al., Applied Optics 62 (2023) 4943
Speaker
Vladimir E. Kaydashev
Southern Federal University
Russia
Discussion
Ask question
