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

Erementchouk, Mikhail; Lisyansky, A. A.

doi:10.1103/physrevb.69.075308

Cited by 12 publications

(16 citation statements)

References 36 publications

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“…respectively 24,41,42 However, as has been discussed in Ref. 24, if ω R is far enough from ω d , i.e.…”

Section: −1mentioning

confidence: 91%

“…respectively 24,41,42 However, as has been discussed in Ref. 24, if ω R is far enough from ω d , i.e. if |ω R −ω d | ≫ ∆, where ∆ is the inhomogeneous broadening, the effect of the latter is negligible and the magnitude of the reflection is determined by…”

Section: −1mentioning

confidence: 99%

“…Such a spectrum makes this structure a potential candidate for novel types of devices such as optical switches or modulators. 24,25 It is interesting, therefore, to find out how the refractive index mismatch affects spectral properties of such a structure.…”

Section: −1mentioning

confidence: 99%

“…The reflection coefficient can be obtained by substituting this expression into Eq. (24) with N = 1. The reflection has peculiarities near the exciton frequencies of the host and the defect, and in the absence of broadening becomes 0 at the frequency whereS = 0.…”

Section: −1mentioning

confidence: 99%

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Optical properties of one-dimensional photonic crystals based on multiple-quantum-well structures

Erementchouk

Lisyansky

2005

Phys. Rev. B

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A general approach to the analysis of optical properties of photonic crystals based on multiplequantum-well structures is developed. The effect of the polarization state and a non-perpendicular incidence of the electromagnetic wave is taken into account by introduction of an effective excitonic susceptibility and an effective optical width of the quantum wells. This approach is applied to consideration of optical properties of structures with a pre-engineered break of the translational symmetry. It is shown, in particular, that a layer with different exciton frequency placed at the middle of an MQW structure leads to appearance of a resonance suppression of the reflection.

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“…respectively 24,41,42 However, as has been discussed in Ref. 24, if ω R is far enough from ω d , i.e.…”

Section: −1mentioning

confidence: 91%

Section: −1mentioning

confidence: 99%

Section: −1mentioning

confidence: 99%

Section: −1mentioning

confidence: 99%

See 2 more Smart Citations

Optical properties of one-dimensional photonic crystals based on multiple-quantum-well structures

Erementchouk

Lisyansky

2005

Phys. Rev. B

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“…It is well-known that polycrystalline domains and point and line defects can significantly broaden optical spectra. 26 The maximum reflection wavelength of both simulated and experimental spectra obtained from solutions of different refractive indices is summarized in Fig. 4.…”

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confidence: 99%

Nanopyramid surface plasmon resonance sensors

Chung

Lin

Schultz

et al. 2010

Applied Physics Letters

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We report the achievement of sensitive chemical and biological sensing using periodic gold nanopyramids with nanoscale sharp tips created by a simple and scalable colloidal templating approach. The sharp tips and the long-range periodic structure of the nanopyramid arrays enable the excitement of both localized and propagating surface plasmons. The optical reflection and the detection sensitivity of the templated nanopyramid surface plasmon resonance sensors agree reasonably well with the theoretical predictions using a finite-difference time-domain model. We have also demonstrated that specific antigen-antibody binding can be detected by using nanopyramid arrays in a real-time and label-free manner. © 2010 American Institute of Physics. ͓doi:10.1063/1.3460273͔Surface plasmon resonance ͑SPR͒ technique is of great importance for monitoring binding events in biological systems because it offers a direct and label-free platform for rapid screening test.1-7 Surface plasmons ͑SPs͒ are electromagnetic waves that propagate along a metal/dielectric interface and can be pictured as a traveling charge density wave on the surface of a metal. 8,9 The coupling of incident light with free electrons in metal forms SP waves that are essentially confined to the metal/dielectric interface, leading to a strong concentration of electromagnetic field. The adsorption of molecules to a metal surface significantly changes the oscillation of SPs, resulting in the modulation of light output. The modulation could be monitored by the angular distributions of reflection and transmission, wavelength, intensity, phase, and polarization changes. 1,10 Compared to other immunoassays, such as enzyme-linked immunosorbent assay and radioimmunoassay, 11 the SPR technique is highly promising for rapid and sensitive biosensing because the label-free and real-time characteristics of SPR sensors shorten the sample preparation time, minimize the interference of conjugating radioactive or enzyme labels, and enable direct analyte detection without a sandwich format. 1,2,12 To generate SPs, the difference in the momentum of incident light and SP must be compensated. 9 In the traditional Kretschmann configuration of the attenuated total reflection method, a prism is used to couple the incident light to SPs.10 However, the bulky experimental setup impedes miniaturization and integration in microfluidic systems. 13 The exploitation of localized SPR ͑LSPR͒ around metal nanoparticles is favorable for developing planar on-chip-based sensors.14-16 However, the stochastic separation between neighboring nanoparticles that significantly affects LSPR impedes the sensing reproducibility. Periodically patterned nanostructures, which support both localized and propagating SPR, therefore draw great attention due to their high reproducibility. [17][18][19][20][21] We have developed a scalable bottom-up technique for generating wafer-sized periodic gold nanopyramids with nanoscale tips as an efficient surface-enhanced Raman scattering substrate. [22][23][24] Here we demonst...

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2d Fourier spectroscopy of disordered quantum wells

Erementchouk

2011

Phys. Status Solidi (c)

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We consider the problem of coherent coupling between spatially separated exciton states in disordered quantum wells (QW) from the perspective of two‐dimensional (2d) Fourier spectroscopy, which is sensitive to interaction between excitations. We present the basic theory of spectroscopy of QW that demonstrate split exciton resonances in linear spectra, which is characteristic for long interfacial inhomogeneities.We find that the coherent coupling is governed by the relation between the disorder correlation length rc and the characteristic length of Coulomb correlations RI. If rc ≫ RI the coherent coupling is absent and 2d spectra are simply elongated along the diagonal (inhomogeneously broadened). In the opposite limit coupling exists and manifests itself in the form of respective off‐diagonal peaks in 2d spectra (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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

Cited by 12 publications

References 36 publications

Optical properties of one-dimensional photonic crystals based on multiple-quantum-well structures

Optical properties of one-dimensional photonic crystals based on multiple-quantum-well structures

Nanopyramid surface plasmon resonance sensors

2d Fourier spectroscopy of disordered quantum wells

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