Related Experiment Video
Updated: May 22, 2025
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.2K
Beam Shaping by Stacked Nonlinear Moiré Metasurfaces
1The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics and TEDA Institute of Applied Physics, Nankai University, Tianjin 300071, China.
Nano Letters
|March 13, 2025
Summary
Researchers developed a novel nanofabrication technique for stacked nonlinear moiré metasurfaces. This method enables precise control over twist angles, leading to tunable optical functionalities for advanced photonic applications.
Area of Science:
- Photonics and Nanotechnology
- Nonlinear Optics
- Metasurface Engineering
Background:
- Moiré phenomena offer tunable lattices for photonics research.
- Fabricating stacked moiré metasurfaces presents significant challenges.
- Existing methods limit control over interlayer twist angles and functionalities.
Purpose of the Study:
- To introduce an innovative nanofabrication approach for stacked nonlinear moiré metasurfaces.
- To enable precise control over interlayer twist angles for momentum space engineering.
- To demonstrate simultaneous frequency conversion and wavefront manipulation.
Main Methods:
- Utilized a focused ion beam-assisted nanostructure transfer-welding technique.
- Developed a method for precise control over interlayer twist angles in stacked metasurfaces.
- Investigated nonlinear optical properties, specifically second-harmonic generation.
Main Results:
- Successfully fabricated stacked nonlinear moiré metasurfaces with controlled twist angles.
- Observed intricate, tunable far-field second-harmonic radiation patterns.
- Demonstrated the capability for simultaneous frequency conversion and wavefront manipulation.
Conclusions:
- The developed nanofabrication technique overcomes key fabrication challenges in nonlinear photonics.
- Precise control of twist angles in moiré metasurfaces enables tunable optical responses.
- This advancement opens new possibilities for nonlinear information processing, optical steering, and switching.
Related Concept Videos
01:16Shear on the Horizontal Face of a Beam Element
144
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
144
01:21Boundary Conditions: Lossless Lines
76
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
76