Radiation filters for the terahertz range using total internal reflection phenomenon

The optical filter under development employing frustrated total internal reflection is a micro-mechanical device containing two silicon rectangular prisms. There is a flat silicon plane among hypotenuse edges of the prisms. The silicon plane is a Fabry-Perot resonator, with clearances h₁ among the plate and prism edges being its mirrors. Theoretical resolution of the optical filter would be R ap 1,5middot10³ if h₁= 50 mum and R ap 3middot10⁵ if h₁ = 100 mum with the thickness of the silicon plane being h = 65 mum; wavelength lambda = 100 mum; free spectral region Deltalambda/lambda ap 0,3...0,4, transmission in the maximum of spectral characteristics 0,6 (provided input and output silicon prism legs bloom).