Two-dimensional photon crystal polarization beam dividing device

Abstract

The planar photon crystal bundle-dispersing polarimeter is characterized in that it's a planar seasonal structure. It's structured by inserting the dielectric stick to the background media or form a air stick by any measure in the solid background media whose refractive index is much higher than that of the dielectric stick. From left to right along the incident direction of the electromagnetic wave, the seasonal structure is a quadrangle. The left parallel side that is also the incident side covers all the incident wave beams, and has a angle with the incident electromagnetic wave; the right parallel side covers all the outdiffusing wave beams. The rest two sides are both out of the transmission bound of the wave beam. This invention has an advantage that the fixity of all the standards of the photon crystal itself won't metamorphose. When the work wavelength is the same, the crystal lattice constant of this invention is much smaller than that of the present planar photon crystal bundle-dispersing polarimeter. Therefore it's portable and cabinet.

Description

[0001] Technical field: The present invention relates to an electromagnetic wave polarization beam splitter, specifically a two-dimensional photonic crystal polarization beam splitter. Background technique: [0002] Photonic crystal is a dielectric structure with periodicity in space, while two-dimensional photonic crystal is a dielectric structure with periodicity in two-dimensional plane. When electromagnetic waves propagate, they are generally unpolarized, that is, they have two mutually perpendicular polarization components that are not equal to zero. A polarizing beam splitter is a device that decomposes an incident unpolarized electromagnetic wave into two beams of electromagnetic waves with different polarizations. When an electromagnetic wave propagates in a two-dimensional photonic crystal, it can be decomposed into two polarization components parallel to and perpendicular to the axis of the two-dimensional plane, called P and S waves. [0003] Chinese Patent No. 9811...

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Problems solved by technology

[0006] For a certain working wavelength, the appearance of the band gap requires that its lattice constant is comparable to the wavelength, or even larger than the wavelength. For the two-dimensional photonic crystal polarizers in the above two articles, its λ / a, that is, the working wavelength and the lattice constant The ratio of the polarizer is about 5:1 to 1:1, so its volume is limited and cannot be made small, especially if the working wavelength is in the microwave to radio frequency band, the volume of the polarizer will be quite large, which is not conducive to the development of integrated optics. Require.

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