The temperature-dependent spectral properties of filter substrate materials in the far-infrared (6–40 μm)

Hawkins, Gary; Hunneman, Roger

doi:10.1016/s1350-4495(03)00180-4

Cited by 34 publications

(14 citation statements)

References 20 publications

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“…Overall, the measured refractive indices for the four materials agree fairly well with the reported or pre dicted values. 9,10 Thickness measurements at room temperature for the sample materials agree with di rect physical measurements made with a highprecision micrometer and a laser micrometer, whose uncertainties are �5 and �2.5 �m, respectively. The initial guess used for each measurement was the vendorspecified thickness.…”

supporting

confidence: 61%

Use of Michelson and Fabry–Perot interferometry for independent determination of the refractive index and physical thickness of wafers

Gillen¹,

Guha

2005

Appl. Opt.

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We present a method to independently measure the refractive index and the thickness of materials having flat and parallel sides by using a combination of Michelson and Fabry-Perot interferometry techniques. The method has been used to determine refractive-index values in the infrared with uncertainties in the third decimal place and thicknesses accurate to within +/- 5 microm for materials at room and cryogenic temperatures.

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supporting

confidence: 61%

Use of Michelson and Fabry–Perot interferometry for independent determination of the refractive index and physical thickness of wafers

Gillen¹,

Guha

2005

Appl. Opt.

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“…For each of the plate, ZnSe has been chosen as dielectric due to its optimized mechanical and thermal properties at infrared frequency regime. The dielectric constant of ZnSe in the desired frequency range is taken from the well‐known experimental results . All the metallic structures possess thickness of 0.15 μm whereas each of the dielectric plate is 0.25 μm thick.…”

Section: Design Of the Structurementioning

confidence: 99%

“…The dielectric constant of ZnSe in the desired frequency range is taken from the well-known experimental results. 31 All the metallic The design of the middle layer has been optimized to achieve a broadband linear polarization conversion of incident wave. The evolution of the middle layer's fractal geometry along with the effect on polarization conversion bandwidth is depicted in Table 1.…”

Section: Design Of the Structurementioning

confidence: 99%

A metasurface‐based broadband quasi nondispersive cross polarization converter for far infrared region

Nilotpal

Nama

Bhattacharyya

et al. 2019

Int J RF Microw Comput Aided Eng

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A broadband nondispersive cross polarization converter (CPC) structure using metasurface for far infrared region has been proposed in this article. The structure is transmittive in nature, which converts a linearly polarized incident wave to its mutually orthogonal linearly polarized wave over a band of frequency ranging from 10.25 to 22.7 THz maintaining a high polarization conversion ratio (PCR) of more than 0.95. The fractional bandwidth of 75.6% corresponding to the center frequency of PCR bandwidth having more than 0.9 PCR value has been realized. The structure is also studied for oblique incidences where it shows wide band polarization conversion up to 45° for both TE and TM polarized oblique incident waves. The electric field distributions at the top and bottom surfaces of the structure close to the center frequency of polarization conversion bandwidth indicate the orthogonal rotation of incident linearly polarized wave at the frequency of interest. For the given set of media interface a separate study on polarization conversion through Brewster angle concept has been carried out simultaneously. The structure exhibits high PCR by maintaining the compactness in thickness (~ λ/5) as well as periodicity (~ λ/3) compared to the existing reported ones.

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“…A major difficulty in accurately characterizing the thermo-optic coefficient in chalcogenide glasses is in acquiring data at a sufficient number of visible and infrared wavelengths to allow a reasonable fit for the theoretical models [56]. Changes in the refractive index as a function of both wavelength and temperature for crystalline germanium [57] and a germanium-containing chalcogenide glass are shown in Plate III (between pages 330 and 331). The refractive index of the germanium crystal is a stronger function of temperature than that of the chalcogenide glass; however, this is not the case for all compositions, and in some cases the value of dn/dT can even be negative.…”

Section: 6mentioning

confidence: 99%

Thermal properties of chalcogenide glasses

Musgraves

Richardson

2014

Chalcogenide Glasses

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The temperature-dependent spectral properties of filter substrate materials in the far-infrared (6–40 μm)

Cited by 34 publications

References 20 publications

Use of Michelson and Fabry–Perot interferometry for independent determination of the refractive index and physical thickness of wafers

Use of Michelson and Fabry–Perot interferometry for independent determination of the refractive index and physical thickness of wafers

A metasurface‐based broadband quasi nondispersive cross polarization converter for far infrared region

Thermal properties of chalcogenide glasses

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