When it comes to nonlinear optical effects, Second Harmonic Generation (SHG) plays a crucial role in determining the properties of materials. Traditionally, SHG has been observed in crystals with broken symmetry (i type), but its occurrence in magnetic systems (c type) has been relatively weak. This limitation has hindered its potential applications in optical devices, leading researchers to explore new avenues for enhancing SHG in materials.
In recent years, two-dimensional van der Waals materials have gained significant attention due to their unique properties and potential applications in optoelectronics. However, the nonlinear optical properties of these materials, especially the connection between SHG and magnetic order, have remained largely unexplored. This gap in knowledge has limited our understanding of the full capabilities of 2D magnetism in optical devices.
A recent study led by Professor Sheng Zhigao has shed light on the strong nonlinear magnetic Second Harmonic Generation (MSHG) induced by ferromagnetic order in monolayer CrPS4. Through the use of the Steady High Magnetic Field Facility, the research team was able to observe a significant c type SHG effect in odd-layered CrPS4, marking the first instance of ferromagnetic order-induced SHG in a 2D magnet under the electric-dipole approximation.
The discovery of ferromagnetic order-induced c type SHG effects with a signal strength comparable to i type SHG highlights the potential of 2D magnetism in nonlinear optical applications. By understanding the intricate relationship between magnetic order and SHG effects, researchers can explore new possibilities for developing advanced optoelectronic devices with enhanced performance and efficiency.
The research conducted by Professor Sheng Zhigao and his team represents a significant step forward in the field of nonlinear optics and 2D magnetism. By uncovering the strong nonlinear magnetic Second Harmonic Generation induced by ferromagnetic order in monolayer CrPS4, the study opens up new avenues for exploring the potential of 2D materials in optoelectronic applications. This breakthrough discovery paves the way for future research in enhancing the optical properties of materials and developing cutting-edge technologies for various industries.