Employment of absorbing a-C:H films in reflective liquid-crystal light modulators

Konshina, E. A.; Onokhov, A. P.

doi:10.1134/1.1259534

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…The intensity of reading out radiation has no influence on photo-addressing of the a-Si:C:H. The a-C:H films absorbing in the visible region were employed as a light-blocking layer in the optically addressed spatial light modulators operating in the reflective mode with a-Si:C:H photosensor. It is allowed to decide the problem of optical decoupling of the write and read light signals in [59][60][61]. The a-C:H films that are transparent in the visible spectral range, with n < 1.7 and high resistivity (~10 13 Ω cm), can arbitrarily be referred to as polymer-like, which were used as orienting layers for liquid crystals.…”

Section: Application Of Optical Properties Of the Filmsmentioning

confidence: 99%

Amorphous Hydrogenated Carbon Films with Diamond-Like and Polymer-Like Properties

Konshina¹

2016

Crystalline and Non-Crystalline Solids

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Results of the study of structural features and optical properties of thin films of amorphous hydrogenated carbon (a-C:H) films prepared by plasma-activated chemical vapor deposition of various hydrocarbon precursors are reviewed. The effect of different factors on the rate of a-C:H films deposition in a DC glow discharge with the magnetron plasma localized near the anode such as voltage, discharge power, gas pressure, relative content of an inert gas in the mixture with a hydrocarbon and other is analyzed. It is shown that the refractive index of a-C:H films can be changed in the interval 2.35-1.55 by increasing the deposition rate and the choice of the appropriate hydrocarbon precursor. The features of the vibration spectra of the diamond-like and polymer-like films are discussed. The correlations of the structural peculiarities and of the optical absorption edge, gap width, and conductivity as well as the absorption spectra in visible region and the ratio of the fundamental bands in Raman scattering spectra are estimated. Examples of using the optical properties of the a-C:H films are given.

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Section: Application Of Optical Properties Of the Filmsmentioning

confidence: 99%

Amorphous Hydrogenated Carbon Films with Diamond-Like and Polymer-Like Properties

Konshina¹

2016

Crystalline and Non-Crystalline Solids

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“…The 0.5 µm thick a-C:H LBL completely blocked green light with λ = 550 nm. The 1 µm thick a-C:H with α ∼ 5 × 10 4 cm −1 at λ = 633 nm attenuated the light flux penetrating into the a-Si:H and a-Si:C:H photosensors by a factor of 100 and the transmittance of red light was less than ∼1% [27,29]. However, to ensure the high spatial resolution of the reflective type OASLMs, the LBL and the a-Si:C:H photosensor need to correspond electrically.…”

Section: Correlation Of Electrical Resistivity and Tauc Gap Of The A-...mentioning

confidence: 99%

“…It has been shown that changes in absorption in the visible region of the spectrum are accompanied by changes in the electronic structure and the optical gap width of a-C:H films prepared from the dc acetylene plasma [33]. The absorption coefficient at a wavelength of 633 nm of the a-C:H films depends on the kinetic of the PECVD process in the dc glow discharge [27,35,36]. We studied correlations of the absorption coefficient at λ = 633 nm with the electrical resistivity and the optical gap width of the a-C:H films.…”

Section: Correlation Of Electrical Resistivity and Tauc Gap Of The A-...mentioning

confidence: 99%

“…The employment of an amorphous hydrogenated carbon (a-C:H) film absorbing in the visible region as an LBL in the OASLMs with a-Si:C:H photosensor is a novel technical solution of the problem of optical decoupling of the write and read light signals [27][28][29]. The 0.5 µm thick a-C:H LBL and the dielectric mirror with reflectivity equal to 80% have ensured writing and reading a diffraction grating at the same wavelength of 633 nm in the OASLM with a deformed helix FLC [28].…”

Section: Introductionmentioning

confidence: 99%

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Properties of a-C:H light-blocking layer used for optical isolation of a-Si:C:H photosensor in reflective liquid crystal spatial light modulators

Konshina

Феоктистов

2001

J. Phys. D: Appl. Phys.

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Novel employment of the absorbing a-C:H layer for optical isolation of an a-Si:C:H photosensor in the reflective liquid crystal optically addressed spatial light modulators is discussed. The dependences of electrical resistivity ρ, Tauc gap ET and an absorption coefficient α at 633 nm on the deposition rate of the a-C:H films in the interval from 1 to 10 Å s-1 were compared and correlations between these properties were ascertained to match the a-C:H layer with the a-Si:C:H layer electrically. Current-voltage characteristics of ITO/a-C:H and ITO/a-Si:C:H/a-C:H thin-film structures were measured using a mercury droplet contact. Our investigations showed that the absorbing a-C:H layer with α~4×104 cm-1 at λ = 633 nm-1, ρ in the range from 1010 to 1011 Ω cm, and ET in the range from 1.25 up to 1.5 eV can ensure effective optical isolation and be a well matched couple with the a-Si:C:H photoconductor. The photocurrent and dark current I-V characteristics of such ITO/a-Si:C:H/a-C:H thin-film structures were symmetrical. The ratio between photocurrents and dark currents of such structures was governed by the photosensitivity of the a-Si:C:H layer and depended on the electrical resistance of the a-C:H layer.

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Absorption and the optical gap of a-C:H films produced from acetylene plasmas

Konshina

1999

Semiconductors

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Employment of absorbing a-C:H films in reflective liquid-crystal light modulators

Cited by 3 publications

References 3 publications

Amorphous Hydrogenated Carbon Films with Diamond-Like and Polymer-Like Properties

Amorphous Hydrogenated Carbon Films with Diamond-Like and Polymer-Like Properties

Properties of a-C:H light-blocking layer used for optical isolation of a-Si:C:H photosensor in reflective liquid crystal spatial light modulators

Absorption and the optical gap of a-C:H films produced from acetylene plasmas

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