Acousto-optic effect in random media

Hoskins, Jeremy G.; Schotland, John C.

doi:10.1103/physreve.95.033002

Cited by 11 publications

(14 citation statements)

References 38 publications

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“…Another is the ultrasonic modulation of multiply scattered light. [ 184 ] The underlying mechanism is that through the photons and phonons coupling, it will give rise to a carrier density variation in the media, which further changes the complex refractive index of the transparent material, equivalent to the phase and absorption modulation. [ 29,71,185,186 ]…”

Section: Acousto‐optic Effect and Its Applications For 2d Materialsmentioning

confidence: 99%

Tunable Optical Properties of 2D Materials and Their Applications

Ren

et al. 2020

Advanced Optical Materials

120

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unlimited possibilities in the improvement of the performances of optoelectronic devices. [19-23] Beyond that, the properties of 2D materials can be tuned in situ by using different approaches [24-26] to expand the functionalities of optoelectronic devices. Out of them, the tunability in their optical properties has attracted great interest over the past decades where researchers dedicated to discovering various tuning methods to realize desired outcomes. [27,28] More excitingly, owing to the unprecedented electronic properties, high stretchability, magnetism, and thermal conductivity of 2D materials, different tuning approaches such as electrical gating, external strain stimuli, a static magnetic field, surface acoustic waves (SAWs), and thermal heating can be simultaneously adopted to participate the light-matter interaction, leading to the tailored and synergetic optical response of 2D materials. [29] Table 1 illustrates a brief advantages and weaknesses analysis between different optical tuning approaches of 2D and non-2D materials. There is a huge potential to revolutionize the optoelectronic devices by incorporating 2D materials with tunable optical properties. [30,31] So far, researchers have achieved flagship milestones in this area where a diverse set of high-performance optical devices are realized including modulators, photodetectors, optical sources, and optical switches. [32] In this review, we primarily focus on the theoretical and experimental researches of optical effects causing by various external stimuli in 2D materials. In Section 2, 2D materials with electro-optic effect and its application will be discussed, followed by piezophototronic effect and its application in Section 3. In Section 4, 2D materials with magneto-optic effect and its application will be discussed. Then, acousto-optic (AO) effect and its application, and thermo-optic (TO) effect and its application will be discussed in Sections 4 and 5, respectively. In the last section, the conclusion and perspective will be provided. 2. Electro-Optic Effect and Its Applications for 2D Materials 2.1. 2D Materials with Electro-Optic Effect In a broad sense, electro-optic effect is about an optical property change in the materials when applying an electric field. As shown in Figure 1, the refractive index of the material can be tuned in the presence of electric field due to the variation of charge carrier density. [29] This effect involves several Recent efforts have been heavily devoted to the development of next-generation optoelectronic devices based on 2D materials, due to their unique optical properties that are distinctly different from those of bulk counterparts. Given that the feature of flexible tunability is highly desired, various approaches have been demonstrated to efficiently modulate the optical properties, eventually enabling peculiar functionalities or realizing high-performance nanoscale devices. Here, this review focuses on recent advances in tuning the optical properties of 2D materials by external stimuli including elec...

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Section: Acousto‐optic Effect and Its Applications For 2d Materialsmentioning

confidence: 99%

Tunable Optical Properties of 2D Materials and Their Applications

Ren

et al. 2020

Advanced Optical Materials

120

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“…However, the mathematical details of the acousto-optic inverse problem vary considerably depending on the properties of the optical medium and the manner in which it responds to acoustic waves. In this paper we will consider the acousto-optic inverse problem in the multifrequency regime described by Hoskins and Schotland in [13], where the dielectric permittivity of the medium is perturbed by the acoustic wave. Here the perturbation of the medium by acoustic waves leads to a detectable frequency shift in the scattered light.…”

Section: Introductionmentioning

confidence: 99%

“…To describe the system more precisely, consider a bounded smooth domain X ⊂ R 3 , and suppose that the specific intensity of the source frequency is represented by the function u : X × S 2 → R. Here u(x, θ) represents the intensity of light at the point x ∈ X in the direction θ ∈ S 2 . Following [13]…”

Section: Introductionmentioning

confidence: 99%

“…Now consider a perturbation of the domain by an ultrasound wave of the form cos(Q·x), for some Q ∈ R 3 . In [13], the authors show that in the physical regime they describe, the ultrasound perturbation generates frequency-shifted light modeled by the equations θ · ∇u 00 = Au 00 θ · ∇u 01 = Au 01 + a cos(Q · x)u 00…”

Section: Introductionmentioning

confidence: 99%

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Radiative transport model for coherent acousto-optic tomography

Chung¹,

Hoskins²,

Schotland³

2020

Inverse Problems

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The paper [13] describes a physical regime in which the ultrasound perturbation of a scattering optical medium leads to a frequency shift in some of the scattered light. In this paper we consider the inverse problem of recovering the optical properties of this medium from measurements of the frequency-shifted light, using a radiative transport equation (RTE) model for light propagation. Given some assumptions on the regularity and isotropicity of the coefficients of the RTE, we show that the absorption coefficient can be reconstructed from the boundary measurements of a single well chosen illumination, and that the scattering coefficients can be reconstructed from boundary measurements of a one-parameter family of illuminations. arXiv:1910.04798v1 [math.AP] 10 Oct 2019Lemma 5.2. Let g = g θ 2 h be defined by (5.2), and let v solve the adjoint RTE (2.1) with boundary condition v| Γ + = g| Γ + . Then

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Acousto-optic imaging in random media

Schotland

2020

Progress in Optics

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Acousto-optic effect in random media

Cited by 11 publications

References 38 publications

Tunable Optical Properties of 2D Materials and Their Applications

Tunable Optical Properties of 2D Materials and Their Applications

Radiative transport model for coherent acousto-optic tomography

Acousto-optic imaging in random media

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