Polariton dispersion law in periodic-Bragg and near-Bragg multiple quantum well structures

Deych, Lev; Lisyansky, A. A.

doi:10.1103/physrevb.62.4242

Cited by 56 publications

(42 citation statements)

References 9 publications

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“…determines the boundary of the forbidden gap 13 as a point where κ h vanishes. The frequency, which corresponds to this boundary determines the width of the gap as 2Γω h /π.…”

Section: Reflection Spectrum Of a Mqw Structurementioning

confidence: 99%

“…In the vicinity of the exciton frequency ω h , there exist two polariton branches separated by a polariton band gap. 13 There are also pure photonic bands with the band boundaries at the geometrical resonances, φ(ω r ) = nπ (n = 1, 2 . .…”

Section: Reflection Spectrum Of a Mqw Structurementioning

confidence: 99%

“…As a result, the band gap between two polariton branches becomes of the order of magnitude of √ ΓΩ 0 ≫ Γ, where Ω 0 is the frequency of the exciton transition. These, so called Bragg MQW structures were quite intensively studied both theoretically 1,2,8,13 and experimentally. 6,9,10,11,12 In the case of structures with a small number of periods, the reconstruction of the optical spectra in Bragg MQW's can be described as a concentration of the oscillator strengths of all oscillators in one super-radiant mode, while all other modes become dark.…”

Section: Introductionmentioning

confidence: 99%

“…When the number of periods in the structure becomes large enough, the modes of the MQW are more conveniently described in terms of stationary polaritons of infinite periodic structures. 13 The spectrum of polaritons in this case consists of two branches separated by a polariton gap, which is normally proportional to the lightexciton coupling constant, Γ. There exists, however, a special arrangement of MQW's where the magnitude of the gap can be significantly increased.…”

Section: Introductionmentioning

confidence: 99%

“…1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 The main motivation for this interest is the potential in these systems for effective control of the light-matter interaction. Quantum wells in MQW structures are separated from each other by relatively thick barriers, which prevent a direct interaction between excitons localized in different wells.…”

Section: Introductionmentioning

confidence: 99%

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Effects of inhomogeneous broadening on reflection spectra of Bragg multiple quantum well structures with a defect

Erementchouk

Lisyansky

2004

Phys. Rev. B

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The reflection spectrum of a multiple quantum well structure with an inserted defect well is considered. The defect is characterized by the exciton frequency different from that of the host's wells. It is shown that for relatively short structures, the defect produces significant modifications of the reflection spectrum, which can be useful for optoelectronic applications. Inhomogeneous broadening is shown to affect the spectrum in a non-trivial way, which cannot be described by the standard linear dispersion theory. A method of measuring parameters of both homogeneous and inhomogeneous broadenings of the defect well from a single CW reflection spectrum is suggested.

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“…determines the boundary of the forbidden gap 13 as a point where κ h vanishes. The frequency, which corresponds to this boundary determines the width of the gap as 2Γω h /π.…”

Section: Reflection Spectrum Of a Mqw Structurementioning

confidence: 99%

Section: Reflection Spectrum Of a Mqw Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of inhomogeneous broadening on reflection spectra of Bragg multiple quantum well structures with a defect

Erementchouk

Lisyansky

2004

Phys. Rev. B

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Superradiant Mode and Photonic Band of a One-Dimensional Resonant Bragg Reflector

Cho

Ikawa

2002

phys. stat. sol. (a)

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Based on a most general framework of dispersion equation for EM waves in a periodic system which contains both the effects of resonant levels and Bragg reflection, we have derived the dispersion equation of polaritons in the 1D resonant Bragg reflector (lattice constant equal to one half of the resonant wavelength). This equation gives a gap mode in the middle of the lowest photonic gap, which does not exist in the dispersion derived from a transfer matrix in the absence of nonradiative damping. The evolution of the superradiant (SR) mode is discussed as a function of the layer number N of the Bragg reflector from the reflectance in frequency and time domains. The frequency dependence of radiative correction is shown to be essential to obtain the consistent picture of the SR mode (small N) and photonic band formation (large N) in the whole range of N.Introduction There has been a lot of interest in the studies of optical media containing aspects of both resonance and Bragg reflection. A specific combination of these two aspects leads to a resonant Bragg reflector. A typical example is a one-dimensional stack of N identical layers (or quantum wells) with a lattice constant d that is equal to half the resonant wavelength. In this system, resonant light with zero lateral wavevector can interact with all the layers in phase, so that a particular combination of the excitations on the layers can almost monopolize the radiation-matter interaction, forming the superradiant (SR) mode.Since the radiative width of the SR mode is N times that of a single layer (G 0 ) [1-3], the coupling with light can become extremely large with increasing N. This leads to a picture of the SR mode having its central frequency near the original resonance frequency w 0 and having the radiative width NG 0 . However, this picture does not fit well to the other limiting case of a photonic band. For N ! 1, the system becomes a photonic crystal made of resonant medium. Because of the resonant Bragg condition, there occurs a photonic gap just around the resonance energy of the medium, which excludes propagating modes of light in this frequency range. In such a situation, it is hard to imagine that there occurs a SR mode broadened radiatively in this frequency range. Thus, it is necessary to establish a consistent picture connecting the two regimes for small and large N.There is an additional problem about the resonant Bragg reflector concerning the form of the dispersion curves for N ! 1. In the literature, the following form of the dispersion equation is used for frequency w and 1D wavenumber k [4-6]:

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Combination of Expanded Graphite/Fe/Fe₃O₄ Composites and Hollowed Out Chiral Metamaterials toward Ultrathin, Ultralight, Broadband, Polarization‐Insensitive, and Wide‐Angle Absorbers

Lü

et al. 2020

Adv Materials Inter

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Achieving thin, light, broad, and strong absorption properties for traditional electromagnetic wave absorbers remains a big challenge. In the present study, an ultrathin, single‐layer hybrid absorber consisting of a periodic array of hollowed out chiral mosquito‐incense unit cells filled by expanded graphite(EG)/Fe/Fe3O4 composites is proposed to drastically improve the integrated properties of traditional absorbers. The experiment verifies that absorption of the hybrid absorber remains higher than 90% at the frequency range of 21.4–36.3 GHz, which corresponds to the ultrathin thickness (0.5 mm), ultralight weight (0.83 kg m−2), and wide‐angle absorption (15°–60°). The equivalent LC circuit and current distribution are given to reveal that the superior properties stem from the synergistic effect of λ/4 resonances, multiple LC‐resonances, cross‐polarization, and cross‐coupling of the patterned structure. This finding demonstrates the potential for hybrid absorbers of ultra‐lightweight, ultrathin, broadband, polarization insensitive, and wide‐angle absorption to be used in millimeter wave devices.

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Polariton dispersion law in periodic-Bragg and near-Bragg multiple quantum well structures

Cited by 56 publications

References 9 publications

Effects of inhomogeneous broadening on reflection spectra of Bragg multiple quantum well structures with a defect

Effects of inhomogeneous broadening on reflection spectra of Bragg multiple quantum well structures with a defect

Superradiant Mode and Photonic Band of a One-Dimensional Resonant Bragg Reflector

Combination of Expanded Graphite/Fe/Fe₃O₄ Composites and Hollowed Out Chiral Metamaterials toward Ultrathin, Ultralight, Broadband, Polarization‐Insensitive, and Wide‐Angle Absorbers

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Polariton dispersion law in periodic-Bragg and near-Bragg multiple quantum well structures

Cited by 56 publications

References 9 publications

Effects of inhomogeneous broadening on reflection spectra of Bragg multiple quantum well structures with a defect

Effects of inhomogeneous broadening on reflection spectra of Bragg multiple quantum well structures with a defect

Superradiant Mode and Photonic Band of a One-Dimensional Resonant Bragg Reflector

Combination of Expanded Graphite/Fe/Fe3O4 Composites and Hollowed Out Chiral Metamaterials toward Ultrathin, Ultralight, Broadband, Polarization‐Insensitive, and Wide‐Angle Absorbers

Contact Info

Product

Resources

About

Combination of Expanded Graphite/Fe/Fe₃O₄ Composites and Hollowed Out Chiral Metamaterials toward Ultrathin, Ultralight, Broadband, Polarization‐Insensitive, and Wide‐Angle Absorbers