Investigation of dielectric spaced resonant mesh filter designs for PMIRR

Irwin, Patrick; Calcutt, S. B.; Taylor, F. W.; Seeley, J. S.; Hunneman, Roger; Walton, Lindsay R.

doi:10.1016/0020-0891(93)90111-j

Cited by 9 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been shown theoretically [6] that a uniform AR coating thickness on a hemispherical lens gives essentially the same efficiency as an optimized coating of variable thickness with a difference of less than 0.5%. Irwin [7] has used parylene as an AR coating on silicon at mid-infrared wavelengths in the construction of dielectric-spaced resonant mesh filters. He reports both refractive index and absorption coefficient data for parylene N. The results indicated that the refractive index was either 1.44 or 1.62, and the absorption coefficient was too large for his application at those frequencies.…”

Section: Introductionmentioning

confidence: 99%

An anti-reflection coating for silicon optics at terahertz frequencies

Gatesman

Waldman

et al. 2000

IEEE Microw. Guid. Wave Lett.

140

View full text Add to dashboard Cite

A method for reducing the reflections from silicon optics at terahertz frequencies has been investigated. In this study, we used thin films of parylene as an anti-reflection (AR) layer for silicon optics and show low-loss behavior well above 1 THz. Transmittance spectra are acquired on double-sided-parylene-coated, high-resistivity, single-crystal silicon etalons between 0.45 THz and 2.8 THz. Modeling the optical behavior of the three-layer system allowed for the determination of the refractive index and absorption coefficient of parylene at these frequencies. Our data indicate a refractive index, , of 1.62 for parylene C and parylene D, and a reasonably modest absorption coefficient make these materials a suitable AR coating for silicon at terahertz frequencies. Coatings sufficiently thick for AR performance reduced the average transmittance of the three-layer system by 10% compared to a lossless AR coating with an ideal refractive index.

show abstract

Section: Introductionmentioning

confidence: 99%

An anti-reflection coating for silicon optics at terahertz frequencies

Gatesman

Waldman

et al. 2000

IEEE Microw. Guid. Wave Lett.

140

View full text Add to dashboard Cite

show abstract

“…The effect has been reported by others as well. 5 We find no such anomalous absorptions with our current fabrication methods. Our earlier work on freestanding metal grids 15 included techniques for making threedimensional ͑3D͒ metallic structures from similar patterns.…”

Section: Report Datementioning

confidence: 55%

“…Simple cross-shaped structures, dubbed ''resonant crosses'' because they are geometrically and electrically analogous to the superposition of inductive and capacitive grids, can also be either free standing ͑''inductive''͒ or not ͑''capacitive''͒, in nature. 2,3 Ulrich's designs have been developed and incorporated into submillimeter and far-infrared filters, 4,5 which typically have layer spacings of tens of microns or more, and can be assembled manually. Metallic photonic band-gap ͑MPBG͒ structures-periodic metallic struc-tures producing frequency regions in which electromagnetic waves cannot propagate-possess some similar mechanical and electromagnetic properties.…”

mentioning

confidence: 99%

Designer infrared filters using stacked metal lattices

Smith

Rebbert

Sternberg

2003

Applied Physics Letters

View full text Add to dashboard Cite

We have designed and fabricated infrared filters for use at wavelengths տ15 microns. Unlike conventional dielectric filters used at the short wavelengths, ours are made from stacked metal grids, spaced at a very small fraction of the performance wavelengths. The individual lattice layers are gold, the spacers are polyimide, and they are assembled using integrated circuit processing techniques; they resemble some metallic photonic band-gap structures. We simulate the filter performance accurately, including the coupling of the propagating, near-field electromagnetic modes, using computer aided design codes. We find no anomalous absorption. The geometrical parameters of the grids are easily altered in practice, allowing for the production of tuned filters with predictable useful transmission characteristics. Although developed for astronomical instrumentation, the filters are broadly applicable in systems across infrared and terahertz bands.

show abstract

“…A consequence of the new optical design was the need to develop small, high aspect ratio (0.94 × 9.0 mm) spectral band‐pass filters. High aspect ratio, long wavelength 30 μ m to 45 μ m passband conductive mesh filters were developed for MCS by the Cardiff University [ Irwin et al , 1993]. Multilayer interference filters for 12 μ m to 17 μ m wavelengths were developed by the University of Reading [ Hawkins and Hunneman , 1994].…”

Section: Investigation Descriptionmentioning

confidence: 99%

Mars Climate Sounder: An investigation of thermal and water vapor structure, dust and condensate distributions in the atmosphere, and energy balance of the polar regions

et al. 2007

View full text Add to dashboard Cite

[1] Against a backdrop of intensive exploration of the Martian surface environment, intended to lead to human exploration, some aspects of the modern climate and the meteorology of Mars remain relatively unexplored. In particular, there is a need for detailed measurements of the vertical profiles of atmospheric temperature, water vapor, dust, and condensates to understand the intricately related processes upon which the surface conditions, and those encountered during descent by landers, depend. The most important of these missing data are accurate and extensive temperature measurements with high vertical resolution. The Mars Climate Sounder experiment on the 2005 Mars Reconnaissance Orbiter, described here, is the latest attempt to characterize the Martian atmosphere with the sort of coverage and precision achieved by terrestrial weather satellites. If successful, it is expected to lead to corresponding improvements in our understanding of meteorological phenomena and to enable improved general circulation models of the Martian atmosphere for climate studies on a range of timescales.

show abstract

Investigation of dielectric spaced resonant mesh filter designs for PMIRR

Cited by 9 publications

References 7 publications

An anti-reflection coating for silicon optics at terahertz frequencies

An anti-reflection coating for silicon optics at terahertz frequencies

Designer infrared filters using stacked metal lattices

Mars Climate Sounder: An investigation of thermal and water vapor structure, dust and condensate distributions in the atmosphere, and energy balance of the polar regions

Contact Info

Product

Resources

About