Thin insulating single crystal films of layer chalcogenides

Abdullaev, G. B.; Abdullaev, A. G.; Aliev, V.K.; Aksyanov, I. G.

doi:10.1002/pssa.2210620249

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…While the existence of Anderson localization of light in 3-dimensional optical materials is still under debate 24,25 , in optical systems with restricted dimensionality one has nowadays evidence for Anderson localization, in particular in optical fibers with transverse disorder 13,26,27 . The possibility of observing transverse localization of light in optical fibers, which are translation invariant along the fiber axis but exhibit disorder in one or two of the transverse directions, was already predicted some time ago 28,29 .…”

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confidence: 99%

What is the Right Theory for Anderson Localization of Light? An Experimental Test

et al. 2018

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Anderson localization of light is traditionally described in analogy to electrons in a random potential. Within this description the disorder strength -and hence the localization characteristicsdepends strongly on the wavelength of the incident light. In an alternative description in analogy to sound waves in a material with spatially fluctuating elastic moduli this is not the case. Here, we report on an experimentum crucis in order to investigate the validity of the two conflicting theories using transverse-localized optical devices. We do not find any dependence of the observed localization radii on the light wavelength. We conclude that the modulus-type description is the correct one and not the potential-type one. We corroborate this by showing that in the derivation of the traditional, potential-type theory a term in the wave equation has been tacititly neglected. In our new modulus-type theory the wave equation is exact. We check the consistency of the new theory with our data using a field-theoretical approach (nonlinear sigma model).

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confidence: 99%

What is the Right Theory for Anderson Localization of Light? An Experimental Test

et al. 2018

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“…The problem under study is of practical importance as will be described later. We study TAL [21,22] as introduced by De Raedt, et al [22]. They considered a dielectric waveguide with a transversely random and longitudinally uniform refractive index profile (quasi-2D).…”

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Modal area statistics for transverse Anderson localization in disordered optical fibers

Abaie

Mafi

2018

Opt. Lett.

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We introduce the mode-area probability density function (MA-PDF) as a powerful tool to study transverse Anderson localization (TAL), especially for highly disordered optical fibers. The MA-PDF encompasses all the relevant statistical information on TAL; it relies solely on the physics of the disordered system and is independent of the shape of the external excitation. We explore the scaling of the MA-PDF with the transverse dimensions of the system and show that it converges to a terminal form for structures considerably smaller than those used in experiments, hence substantially reducing the computational cost to study TAL.

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“…This causes the area of the planar layer to decrease with the increase of temperature. [25,26] From Eq. ( 3), one can obtain the Gruneisen parameter 𝛾 G , and its values at different temperatures are listed in Table 2.…”

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Thermal Expansion and Deformation of Graphene

Zheng-fu

Zheng

2016

Chinese Phys. Lett.

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Taking into consideration short-atomic-range interactions and anharmonic effects, we calculate the thermal expansion coefficients, Gruneisen parameters, the elastic modulus of graphene varying with temperature and the phonon frequency. The anharmonic effects associated with the graphene deformation are also discussed. The results show that the value of thermal expansion coefficient is negative in the moderate temperature range, and it becomes positive when the temperature grows to be higher than a certain value. The change rate of elastic modulus with respect to temperature and pressure are calculated, and phonon frequencies are estimated. In the process of graphene thermal expansion, it is accompanied with the change of bond length and the rotation around the axis normal to the plane. Our results indicate that the effects due to the bond change are more significant than that of the rotation. We also show that if anharmonic effects are ignored, the thermal expansion coefficient and the Gruneisen parameters are zero, and the elastic modulus and the phonon frequency are constant. If anharmonic effects are considered up to the second term, these values will vary with temperature, and become closer to the experimental value. The higher the temperature is, the more significant the anharmonic effects become.

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Thin insulating single crystal films of layer chalcogenides

Cited by 8 publications

References 3 publications

What is the Right Theory for Anderson Localization of Light? An Experimental Test

What is the Right Theory for Anderson Localization of Light? An Experimental Test

Modal area statistics for transverse Anderson localization in disordered optical fibers

Thermal Expansion and Deformation of Graphene

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