Optimization of the conditions for vacuum thermal deposition of bismuth films with control of their imperfection by atomic force microscopy

Грабов, В. М.; Демидов, Е. В.; Комаров, В. А.

doi:10.1134/s1063783410060284

Cited by 22 publications

(11 citation statements)

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“…Bismuth semimetal is the most promising of the pure substances. It forms thin films with predictable characteristics [2][3][4]. In this case, as shown in one of our recent works [5], its refraction index in the IR range is about 9.5, while the absorption index is 1.2.…”

Section: Introductionmentioning

confidence: 69%

“…The absorption resonance in the film corresponds to the condition when the wave that has passed through the film comes out in antiphase with the reflected oneexp(4πin 1 d 1 /λ) = −1, d 1 = (−1 + 2N)λ/(4n 1 ), (4) where Nis the maximum absorption number. Let's find, at what n 1 and k 1 in the first maximum absorption, all power will be absorbed in the film.…”

Section: Introductionmentioning

confidence: 99%

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Fully absorbing one-dimensional photonic crystal

Yu.

2022

Optics and Spectroscopy

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We investigated the resonant absorption capacity of a one-dimensional photonic crystal, the relationship between the resonant frequency and the width of its absorption band, and the composition and thickness of the layers forming it. Frequency oscillations of radiation reflection from 2.5-layer semimetal-dielectric-metal film structures caused by interference on the film thickness were studied. We measured the infrared reflection spectra of Bi87Sb13 film samples on mirror-smooth substrates with a reflective metal (Al, Ti) layer and a dielectric layer MgF2+LiF or SiO2+Si3N4). We have developed samples that absorb up to 99.5% of radiation at maximum and integrally up to 60% of resonant thermal radiation. The composition of structures for interfacing with silicon technologies and constructing matrices of sensitive bolometric receivers has been optimized. We have proposed the implementation of active selective thermal imaging systems with matching the source and receiver of radiation simultaneously in frequency and frequency band. The analogy of the absorbing properties of film structures and the properties of human eye cells was shown. Keywords: bismuth, film, IR, interference, eye color sensitivity.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Fully absorbing one-dimensional photonic crystal

Yu.

2022

Optics and Spectroscopy

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“…The triangular texture reflects the rhombohedral crystalline structure Bi [9]. This form of growth patterns indicates, that the crystallographic orientation of this film corresponds to the direction of the C 3 axis parallel to the film normal [10,11], and C 1 and C 2 axes lie in the substrate plane and they are parallel and oppositely directed in neighboring crystallites [12]. According to mutual position of growth patterns on the film surface the size of film crystallites is determined [11,13]: for 150 nm film the size of crystallites can reach 3 µm (see Fig.…”

Section: Samples Preparationmentioning

confidence: 85%

Terahertz radiation detector based on thermoelectric material Bi-=SUB=-88-=/SUB=-Sb-=SUB=-12-=/SUB=--=SUP=-*-=/SUP=-

et al. 2022

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Terahertz radiation is very promising for visualization, detection and data transfer. Searching for sensitive, fast and compact THz detector that operates at room temperature is a common subject for these applications. Hence, there is still an issue of searching for new materials for THz radiation detection. Solid solutions based on thermoelectric bismuth and antimony appear to have significant potential for these applications. In this paper photoresponse of thermoelectric material Bi88Sb12 has been studied for the first time. Films with thicknesses of 70 and 150 nm were studied under influence of radiation at frequency of 0.14 THz. Keywords: terahertz radiation, photoresponse, bismuth, antimony, thermoelectric materials, thin films.

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“…Mica with a thickness of 21 µm was used as a substrate (one of the thinnest, but with a stable geometry and giving a possibility to synthesize high-quality bismuth film). The temperature, pressure and annealing affect the film quality and permittivity, but the synthesis of bismuth films was carried out under the optimal conditions mentioned above (according to work by Grabov et al 37 ). The film quality (average crystallite size) depends on its thickness.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of optically controlled topological transition in bismuth-mica structure

Zaitsev

Zykov

Demchenko

et al. 2021

Sci Rep

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The hyperbolic materials are strongly anisotropic media with a permittivity/permeability tensor having diagonal components of different sign. They combine the properties of dielectric and metal-like media and are described with hyperbolic isofrequency surfaces in wave-vector space. Such media may support unusual effects like negative refraction, near-field radiation enhancement and nanoscale light confinement. They were demonstrated mainly for microwave and infrared frequency ranges on the basis of metamaterials and natural anisotropic materials correspondingly. For the terahertz region, the tunable hyperbolic media were demonstrated only theoretically. This paper is dedicated to the first experimental demonstration of an optically tunable terahertz hyperbolic medium in 0.2–1.0 THz frequency range. The negative phase shift of a THz wave transmitted through the structure consisting of 40 nm (in relation to THz wave transmitted through substrate) to 120 nm bismuth film (in relation to both THz waves transmitted through substrate and air) on 21 µm mica substrate is shown. The optical switching of topological transition between elliptic and hyperbolic isofrequency contours is demonstrated for the effective structure consisting of 40 nm Bi on mica. For the case of 120 nm Bi on mica, the effective permittivity is only hyperbolic in the studied range. It is shown that the in-plane component of the effective permittivity tensor may be positive or negative depending on the frequency of THz radiation and continuous-wave optical pumping power (with a wavelength of 980 nm), while the orthogonal one is always positive. The proposed optically tunable structure may be useful for application in various fields of the modern terahertz photonics.

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Optimization of the conditions for vacuum thermal deposition of bismuth films with control of their imperfection by atomic force microscopy

Cited by 22 publications

References 1 publication

Fully absorbing one-dimensional photonic crystal

Fully absorbing one-dimensional photonic crystal

Terahertz radiation detector based on thermoelectric material Bi-=SUB=-88-=/SUB=-Sb-=SUB=-12-=/SUB=--=SUP=-*-=/SUP=-

Experimental investigation of optically controlled topological transition in bismuth-mica structure

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