Related Experiment Video
Updated: Jan 27, 2026

Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets
Published on: October 15, 2021
Near-infrared tunable metalens based on phase change material Ge2Se2Te5
Wei Bai1,2,3,4, Ping Yang1,3, Jie Huang2
1The key laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu, Sichuan, 610209, China.
Abstract:
Metasurfaces draw everyone's attention because they can precisely control the phase, amplitude and polarization of emergent light to achieve light field control in recent years. As one of the most practicable devices among the many applications of metasurface, metalens can extremely reduce the size as well as complexity of optical systems and realizes the higher optical quality compared with conventional lens. So it will be very potential to use metalens in integration systems to reaching higher integration and efficiency. In addition, dynamic control is always desirable in optical systems. In this work, we firstly design a near-infrared tunable metalens treating phase change materials as the meta-atoms which makes the tunable metalens become more compact. At designed wavelength of 1.55 μm, the focusing efficiency of our amorphous metalens is more than 16 times of the efficiency when it works at crystalline state, and its focal length can stay almost unchanged when the GST state is switched. The broadband performance of the metalens is also confirmed. This work may bring some good opportunities for the revolution of the next generation tunable integrated optics.
Related Concept Videos
Global Climate Change
Phase Transitions
Phase Diagrams
Work Done During Volume Change
Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
The work done by the gas on the piston can be expressed as
Net Change Theorem
Standard Entropy Change for a Reaction

