Abstract

The power- and phase-transmission spectra of free-standing wire grids at submillimeter wavelengths have been calculated for the case of normal incidence by a least-squares method. The calculations are compared with measurements made on grids wound from 10-μm-diameter tungsten wire with spacings in the 30–65-μm range. The measurements were made at $\tilde{\nu }$ = 29.7 cm⁻¹ (λ = 337 μm) by using an HCN laser and in the 20–450-cm⁻¹ frequency range by a combination of conventional and dispersive Fourier-transform spectrometry. At frequencies below about 100 cm⁻¹, excellent agreement is obtained between theory and experiment, indicating that this work should provide a suitable basis for the design of spectroscopic components, such as laser-coupling devices for use at submillimeter wavelengths. However, there are marked discrepancies between theory and experiment at frequencies near the Rayleigh wavelengths, where d/λ = 1, 2, etc., where d is the wire spacing. From detailed measurements of the periods of the grids, it is concluded that these discrepancies are primarily due to the effects of irregularities in the wire spacings.

© 1981 Optical Society of America

Free-standing fine-wire grids: Their manufacture, performance, and use at millimeter and submillimeter wavelengths

A. E. Costley, K. H. Hursey, G. F. Neill, and J. M. Ward
J. Opt. Soc. Am. 67(7) 979-981 (1977)

Photoacoustic spectroscopy of the ν₃ band of HCN

K. R. German and W. S. Gornall
J. Opt. Soc. Am. 71(12) 1452-1457 (1981)

The Wire Grid as a Near-Infrared Polarizer

George R. Bird and Maxfield Parrish
J. Opt. Soc. Am. 50(9) 886-891 (1960)

Infrared (10.6-μm) radiation induced evaporation of large water drops

Kenneth Sassen
J. Opt. Soc. Am. 71(7) 887-891 (1981)

Attenuated total reflectance measurements of the complex refractive index of polystyrene latex at CO₂ laser wavelengths

S. G. Jennings
J. Opt. Soc. Am. 71(8) 923-927 (1981)