Traditional materials for ultra-thin polarizers are difficult to use due to the engineering involved in the manufacturing process, resulting in poor extinction ratios and poor performance. Two-dimensional (2D) materials, an emerging family of ultrathin materials, exhibit diverse optical, electronic, and magnetic properties, such as flexible band design, anisotropic optical properties, spin-valley coupled physics, and multi-field tunable optics launch, which makes them ideal candidates for exploring new scientific questions and exploring potential device applications.
2D materials have great advantages in overcoming the material limitations of thin polarizers and absorbers, providing new ideas for the development of integrated photonic circuits. Alfa Chemistry can provide unique 2D material solutions that meet customer needs. Contact us today so we can help you with your polarizer and absorber application research.
Polarized Optical Properties of 2D Materials
In polarization device applications, two-dimensional (2D) materials, such as anisotropic materials, valley electronic materials, and other hybrid heterostructures, exhibit a variety of physical and electrical features. The fast development of 2D materials has extended and focused research interests in 2D science, particularly on polarization-related optical characteristics and devices. In polarization device applications, 2D materials such as anisotropic materials, valley electron materials, and other hybrid heterostructures exhibit a wide spectrum of physical and electrical features.
Alfa Chemistry, a 2D materials specialist, can provide you with a wide range of 2D materials and assist you in the study of their polarization-related optical properties. This aids in the discovery of the intrinsic physical features of intense light-matter interactions and the development of smart optoelectronic devices in nanotechnology.
Fig 1. The classification of 2D materials and devices. (Li Z, et al. 2020)
We classify polarization-related 2D materials into three categories, including anisotropic 2D materials, 2D Dirac materials with unequal valleys, and nanophotonic structured coupling materials.
- The energy bands of anisotropic 2D materials such as BP, MX2, and RX2 exhibit anisotropy in space due to their anisotropic atomic structures.
- The graphene and TMD families feature a natural Dirac valley near the K point in the Brillouin zone due to the honeycomb arrangement of atoms.
- Nanophotonic structures are artificial optical units that serve as building blocks for capturing, confining, and modulating photons. Near-field modes of confined photons coupled with excitons produce many-body difficulties when nanophotonic structures are developed to interact with 2D materials, allowing functional optoelectronic devices to be used in new ways.
Perfect Absorber Solution for 2D Materials
Most 2D materials have low light absorption efficiency in the visible and near-infrared regions, resulting in weak light-matter interactions that limit their further applications in optoelectronic devices. Alfa Chemistry can help enhance the light-matter interactions of various 2D materials in the visible and near-infrared regions to support research in optoelectronic devices and related applications. A few typical methods and related physical mechanisms we mainly use for perfect absorbers are narrow-band perfect absorbers, double-band perfect absorbers, and broad-band perfect absorbers.
| Type | 2D Materials Contained | Methods | Center λ (nm) | Quality Factor | Values of Absorption Peaks (%) | Wavelength Range (nm) | Average Absorption of Structure (%) |
|---|
| Narrowband Perfect Absorbers | Graphene | Critical coupling | 1500 | 280 | – | – | – |
| Magnetic dipole resonance | 1306 | 2612 | – | – | – |
| (CH3NH3)PbI3 | Critical coupling | 1310 | 119 | – | – | – |
| MoS2 | Critical coupling | 680 | 77 | – | – | – |
| Tamm plasmon mode | 665 | 60 | – | – | – |
| Dual-Band Perfect Absorbers | MoS2 | Surface plasmon mode and localized gap-plasmon mode | 560 and 672 | – | 100% and 99.1% | – | – |
| Graphene | Guided mode resonance and FP resonance | 1354 and 1586 | – | 95.52% and 96.94% | – | – |
| Guided resonance and guide mode | 1318 and 1417 | – | 100% and 100% | – | – |
| Two different guided-mode resonance | 21.83 A/W | – | 98.96% and 98.22% | – | – |
| Broadband Perfect Absorbers | MoS2 | Taking advantage of the special metamaterial | – | – | – | 594 ~ 809 | 94% |
| Taking advantage of the vertical Bragg stack-like geometry | – | – | – | 350 ~ 700 | 94.7 |
| Taking advantage of the vertical Bragg stack-like geometry | – | – | – | 430 ~ 630 | 90.5% |
| Graphene | Taking advantage of the vertical Bragg stack-like geometry | – | – | – | 454 ~ 651 | 96% |
| (CH3NH3)PbI3 | Taking advantage of the hyperbolic metamaterial | – | – | – | 400 ~ 800 | Almost 100% |
You didn't find what you were looking for? We can deliver unique solutions because of our wide skill set. Please get in touch with us to discuss your needs.
Reference
- Li Z, et al. (2020). "Polarization-Dependent Optical Properties and Optoelectronic Devices of 2D Materials." Research (Wash D C). 2020: 5464258.
Please kindly note that our products are for research use only.
