About Photonic Crystals
Photonic crystals are artificial structures made in regular patterns, a technology that enables control of light that cannot be achieved with naturally occurring materials. However, because of the need to precisely fabricate very fine structures, few companies have even put this technology to practical use.
We have the technology to create photonic crystals simply by stacking multiple layers of films on a wafer with uneven surfaces.
The size of the unevenness can be freely varied from tens of nm to several micrometers.
We can create precise three-dimensional structures with a simple process of a single patterning and deposition of the films.
For example, in the structure shown on the right figure, anisotropy in the structure causes a difference in optical properties between vertical and horizontal polarization. The direction of anisotropy is determined by the pattern of the wafer.
When the thickness of each layer is controlled, the interference of light in the multilayer film allows it to function as a polarizer, in which one polarization is reflected, or as a waveplate, in which the polarization state is changed.
By changing the pattern of the wafer, polarizers and waveplates with various axial distributions can be freely made. In other words, free polarization distribution can be realized.
This technology is used in polarization imaging sensors, multichannel polarization conversion elements for optical communications, and as special filters for semiconductor wafer inspection.
More recently, we have introduced the concept of geometric phase and are working to realize new functions through phase control. We have realized diffraction gratings that can separate left and right circular polarization and control beam shape.
The control of not only polarization but also phase is developing new applications.
Polarized camera that can acquire all polarization information. You can measure DOP, which indicates the degree of polarization, and distinguish between clockwise and counterclockwise circular polarization. A revolutionary camera that can acquire Stokes parameters that indicate the state of polarization.
CRYSTA was researched and developed as the first polarization-sensitive high-speed camera and took more than five years to complete. It enables measurement and visualization of physical quantities and properties in various fields such as biotechnology, military, and aerospace.
Custom Polarizer & Phase Plates
Our products can be customized not only for the optical properties, but also for the shape and the spatial distribution of those properties. In particular, they can be made non-uniformly, having a segmented structure or a curved axis along the surface. Customization of the patterned polarizer/waveplate is welcome.
Axial polarization conversion element SWP Series
A waveplate with 12 axial-azimuth regions that can realize axis-oriented polarization simply by inserting it into the optical path. It converts linear polarization into radial (radial) or concentric (azimuthal) polarization. The high transmittance achieves a conversion efficiency of almost 100%. It is effective in optical tweezers, laser processing, etc.
Birefringence & Stress Strain Measurement
We have improved conventional birefringence measurement from point measurement to 2-D surface measurement. High-speed, high-precision birefringence measurement contributes to quality evaluation and functional improvement of optical materials.
Next-generation Optical Communications
Polarization control is becoming increasingly important in next-generation optical communications. In addition to application examples of our proprietary photonic crystals, we also introduce upcoming functions in the future.
Ultra-precision micro laser processing
Microfabrication technology is becoming increasingly important for next-generation EVs and semiconductor devices. We support the development of this field with our unique beam shaping, polarization control, and high speed temperature imaging technologies.