We demonstrate slow light via population oscillation in semiconductor quantum-well structures for the first time. A group velocity as low as 9600 m/s is inferred from the experimentally measured dispersive characteristics. The transparency window exhibits a bandwidth as large as 2 GHz.

Slow-light in semiconductor quantum wells

Properties of ternary photonic crystal consisting of dielectric/plasma/dielectric as a lattice period

We have theoretically studied the interaction of a light beam with liquids containing absorbing nanoparticles. We have shown that the Soret effect ensures a feedback that essentially limits heat insertion into the system and the change in its temperature: the temperature rise on the axis of a Gaussian beam is inversely proportional to the Soret constant. Transverse spatial redistribution of the absorbing particles gives a specific thickness dependence of the transparency of the material. These properties not only play an essential role in the study of light interactions with absorbing solutions, but also can underlie optical methods for measurements of the Soret constant.

Soret-Feedback in Thermal Diffusion of Suspensions

We analyze an efficient scheme to enhance the Goos-H\"anchen (GH) shifts of the reflected and transmitted beams in a cavity containing two-level atomic medium. A broadband squeezed vacuum field is injected into the cavity to interact with the atomic medium. In the bad cavity limit, the Bloch equations for the atomic operators are identical to those in the free space, but with the modification of the system parameters. Using experimentally achievable parameters, we identify the conditions under which the squeezed vacuum allows us to enhance the GH shifts of the reflected and transmitted beams beyond what is achievable in the absence of the squeezed vacuum. The enhanced GH shifts originate from the coherent population oscillations controlled by the squeezed vacuum field. Furthermore, we also find that the GH shifts of the reflected and transmitted beams depend sensitively on the relative phase between the control field and the squeezed vacuum field. Subsequently, we propose a scheme for such a configuration of the GH shift as a family of hypersensitized displacement sensors. Based on the numerical analysis, the detection sensitivity and minimum detectable value for the tiny displacement can reach approximately $2340\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{m}/\mathrm{nm}$ and 14.4 pm, respectively.

Squeezing-induced giant Goos-Hänchen shift and hypersensitized displacement sensor in a two-level atomic system

In this communication, the transmittance characteristics of one dimensional quasi-periodic photonic crystals is investigated. The proposed structure consists basically of plasma and nanocomposite layers arranged in accordance to the Fibonacci sequence. The effect of volume density of the plasma and the volume fraction of the nanocomposite material on the properties of the photonic band gaps are studied in detail. The effect of layers thicknesses and the sequence number are also taken into account. We believe that such structures can be potentially beneficial in many novel future applications such as multichannel and pass band filters and optical switches. Additionally, such photonic crystals can be used to design tunable optical devises through controlling the plasma and nanoparticle densities.

https://iopscience.iop.org/article/10.1088/1402-4896/ab4c68/pdf

Transmission investigation of one-dimensional Fibonacci-based quasi-periodic photonic crystals including nanocomposite material and plasma

The transfer matrix method used in thin-film optics is extremely useful when applied to analyze the propagation characteristics of electromagnetic waves in planar multilayer optical waveguides. This chapter aims to extend the transfer matrix method to treat the bound modes of the graded-index waveguide. Beginning with a brief introduction of the transfer matrix, we derived the eigenvalue equations and studied the multilayer optical waveguides. Different from the widely used WKB approximation, the transfer matrix obtained some important but different conclusions when applied to the graded-index waveguide, such as the exact phase shift at the classical turning points.

Transfer Matrix Method and the Graded-Index Waveguide

This chapter introduces several basic optical devices based on the attenuated total reflection, including tunable filter, optical sensors, and electro-optical devices. We mainly focus on the description of optical sensors performance. It is found that the bigger the portion of power that propagates in the sample, the higher the sensitivity will be. Moreover, the sensors based on the GH shift are immune to the power fluctuation in the light source since the GH shift is position encoded. Finally, our experiments to explore the magneto-optical modulation and all-optical modulation in the ferrofluid-filled SMCW are given. The results are contributed to the competition between the optical trapping effect and the Soret effect.

Optical Devices Based on the Attenuated Total Reflection

This chapter introduces the readers to the related issues of the non-specular reflection effects and in particular of the Goos–Hanchen (GH) shift. We first briefly review two causality paradoxes in the optical reflection and their corresponding solutions with the consideration of GH time. Then, we elaborately describe the current work on the theoretical explanation and the experimental enhancement of the GH shift. Finally, we give a unified theory for all non-specular reflection effects.

Goos–Hänchen Shift

In the linear planar optical waveguide, the most interested feature parameters include the guiding layer’s refractive index and thickness, the propagation constant, and the propagation loss. On the other side, the feature parameters frequently investigated in the nonlinear planar optical waveguide are the linear and quadratic electro-optical coefficients and the thermo-optical coefficient. Our aim in this chapter was to show the mechanisms and experiment methods of how to exactly characterize these feature parameters, which could lay the groundwork for optimally designing and manufacturing the optical waveguide devices.

Characterizing the Feature Parameters of Planar Optical Waveguide

In this chapter, we first briefly discuss the dispersion equation of the symmetrical metal-cladding waveguide (SMCW), and review some particular properties of the TM0 mode and TM1 mode excited in the SMCW. Then, we give the principle of the free-space coupling technology and the characteristics of the ultrahigh-order mode. Finally, two amusing optical phenomena observed in the SMCW, i.e., the wideband slow light effect and the conical reflection, are analyzed in detail.

Symmetrical Metal-Cladding Waveguide

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