Optical properties of thin films — Where to?

Heavens, O.S.

doi:10.1016/0040-6090(78)90102-5

Cited by 571 publications

(802 citation statements)

References 4 publications

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“…From the effective medium theory 23,24 and the S-parameter retrieval method 25 (Fig. 4b); for the 2 × 2 × 2 mm 3 F4B unit cell, n changes from 1.63 to 1.17 as D varies from 0.1 to 1.9 mm (Fig.…”

Section: Resultsmentioning

confidence: 99%

Three-dimensional broadband and broad-angle transformation-optics lens

2010

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Luneburg lenses have superior performance compared with conventional lenses made of uniform materials with specially designed surfaces, but they are restricted by the difficulty of manufacturing the required gradient-index materials and their spherical focal surfaces. Recently, a new two-dimensional (2D) imaging lens was proposed and realized using transformation optics. such a 2D lens overcomes the aberration problem, has a flattened focal surface and is valid for extremely large viewing angles. Here, we show the design, realization and measurement of a three-dimensional (3D) approximate transformation-optics lens in the microwave frequency band. The 3D lens is made of non-resonant metamaterials, which are fabricated with multilayered dielectric plates by drilling inhomogeneous holes. simulation and experimental results demonstrate excellent performance of the 3D lens for different polarizations over a broad frequency band from 12.4 to 18 GHz. It can also be used as a high-gain antenna to radiate or receive narrow beams in large scanning angles.

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Section: Resultsmentioning

confidence: 99%

Three-dimensional broadband and broad-angle transformation-optics lens

2010

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“…where T ij = 1 − R ij , R ij = |r ij | 2 , and r ij are the Fresnel coefficients for reflection in the interface between layers i and j (Heavens 1995). The three layer coherent (X = c) or non-coherent (X = nc) normal incidence transmission is given by…”

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confidence: 99%

“…where the composite transmission and reflection factors can be written as (Fernández-Torre et al 2005;Heavens 1995)…”

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confidence: 99%

OPTICAL CONSTANTS OF NH₃AND NH₃:N₂AMORPHOUS ICES IN THE NEAR-INFRARED AND MID-INFRARED REGIONS

Zanchet

Rodrı́guez-Lazcano

Gálvez

et al. 2013

ApJ

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Ammonia ice has been detected on different astrophysical media ranging from interstellar medium (ISM) particles to the surface of various icy bodies of our solar system, where nitrogen is also present. We have carried out a detailed study of amorphous NH 3 ice and NH 3 :N 2 ice mixtures, based on infrared (IR) spectra in the mid-IR (MIR) and near-IR (NIR) regions, supported by theoretical quantum chemical calculations. Spectra of varying ice thicknesses were obtained and optical constants were calculated for amorphous NH 3 at 15 K and 30 K and for a NH 3 :N 2 mixture at 15 K over a 500-7000 cm −1 spectral range. These spectra have improved accuracy over previous data, where available. Moreover, we also obtained absolute values for the band strengths of the more prominent IR features in both spectral regions. Our results indicate that the estimated NH 3 concentration in ISM ices should be scaled upward by ∼30%.

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“…The thickness of the ceria layer depends on the thickness of the Ge layer such that the reflection is minimum at the exciting laser wavelength. The calculations of the layer thicknesses have been done using the matrix method, 15 wherein optical constants of Ge and Al were taken to be the same as that of their bulk form and refractive index of CeO 2 layer is 2⋅3.…”

Section: Methodsmentioning

confidence: 99%

Ultra thin films of nanocrystalline Ge studied by AFM and interference enhanced Raman scattering

et al. 2003

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Abstract. Initial growth stages of the ultra thin films of germanium (Ge) prepared by ion beam sputter deposition have been studied using atomic force microscope (AFM) and interference enhanced Raman scattering. The growth of the films follows Volmer-Weber growth mechanism. Analysis of the AFM images shows that Ostwald ripening of the grains occurs as the thickness of the film increases. Raman spectra of the Ge films reveal phonon confinement along the growth direction and show that the misfit strain is relieved for film thickness greater than 4 nm.

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Optical properties of thin films — Where to?

Cited by 571 publications

References 4 publications

Three-dimensional broadband and broad-angle transformation-optics lens

Three-dimensional broadband and broad-angle transformation-optics lens

OPTICAL CONSTANTS OF NH₃AND NH₃:N₂AMORPHOUS ICES IN THE NEAR-INFRARED AND MID-INFRARED REGIONS

Ultra thin films of nanocrystalline Ge studied by AFM and interference enhanced Raman scattering

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Optical properties of thin films — Where to?

Cited by 571 publications

References 4 publications

Three-dimensional broadband and broad-angle transformation-optics lens

Three-dimensional broadband and broad-angle transformation-optics lens

OPTICAL CONSTANTS OF NH3AND NH3:N2AMORPHOUS ICES IN THE NEAR-INFRARED AND MID-INFRARED REGIONS

Ultra thin films of nanocrystalline Ge studied by AFM and interference enhanced Raman scattering

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OPTICAL CONSTANTS OF NH₃AND NH₃:N₂AMORPHOUS ICES IN THE NEAR-INFRARED AND MID-INFRARED REGIONS