Multi Colour Filter Introduction

1. The optical properties of the crystal change in accordance with the pitch of the substrate

Generally the orientation of the transmission axes of the elements of the photonic crystal array are varied.
However, it is also possible to fabricate regions of differing pitch on a single substrate. The figure below shows a diagram of a section of such a structure and typical measured optical characteristics.

Confocal Concept

Thus, an areas with different band edges can be fabricated as a single multilayer film. The multicolour filters (filter array) fabricated in this way have unique features that conventional absorption colour filters do not.

  • Superior when precise wavelength measurement is required
  • Highly durable (inorganic)
  • High degree of control of the transmission characteristics
  • High degree of environmental stability

Currently, spectral imaging by the combination of a two dimensional multicolour filter array and a CCD is under joint development by Assistant Professor Y. Ohtera of The Tohoku University Biomedical Engineering Research Organization (TUBERO) and Photonic Lattice, Inc.

Multifilter