Photonic Crystal Polarizing Optical Components

True Zero Order Waveplate/Ultra-Violet Polarizers

Photonic crystal waveplates are reliable and perfect zero-order waveplates with small incident angle dependence.
For example, a zero-order half-wave plate made of quartz for a wavelength of 266 nm in the ultraviolet region would be about 11 μm thick, but a photonic crystal is deposited on a quartz plate, making it easy to handle.
In addition, since the material is composed entirely of inorganic materials such as hafnium oxide, it remains unchanged even at high temperatures of 400°C and has a high degree of reliability.
The insertion loss is comparable to that of a quartz plate, and multiple axial orientations can be provided on a single element.

Polarizer Specifications
Operating wavelength	> 250 nm (One wavelength, in the range above)
Extinction ratio	≧ 1000　※ Valid within the ±1% band around nominal operating wavelength (customizable)
Transmittance	≧80%
Incident angle	Normal +/- 5°
Thickness	0.5 or 1 mm
Smallest feature size (for patterned element)	1 μm
Damage threshold	10mW / 100 μm2 @ λ=355nm (typical)

Waveplate Specifications
Operating wavelength	> 250 nm (One wavelength, in the range above)
Retardation tolerance	+/-5%
Transmittance	≧85%
Incident angle	Normal to +/- 10°
Thickness	0.5 or 1 mm
Smallest feature size (for patterned element)	1 μm
Damage threshold	10mW / 100 μm2 @ λ=355nm (typical)

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Photonic Crystal Polarizing Optical Components

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Ultra-thin waveplate for optical communications

It has insertion loss comparable to that of a quartz plate and can have multiple axial orientations on a single element.Compact and free polarization control can be realized in optical transceivers, optical modulators, receivers, and wavelength selective switches (WSS) in digital coherent systems.

Half-Mirror Polarizer for Laser Cavity

Reflectivity for each polarization can be tuned separately. As a half-mirror in a laser resonance cavity, the element is used to generate and select the output polarization of the laser. Because of its inorganic nature, the element can withstand very high optical power.

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.