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International journal of scientific researchers ( IJSR ) INDEXING

UNDERSTANDING THE INTERACTION OF LIGHT WITH MATTER Authors

Karimova Vasila Aslidin qizi .Alimova E’tiborxon A’zamjon qizi

Published Jan 11, 2024• 0 citations
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Abstract

Optics, Quantum mechanics, Materials science, Light-matter interaction, Electromagnetic radiation, Photonics, Photovoltaics, Solar energy, Quantum computing, Quantum information, Light-matter scattering, Light-matter absorption, Light-matter emission, Light-matter excitation, Light-matter annihilation, Light-matter recombination, Light-matter interference, Light-matter diffraction, Light-matter polarization, Light-matter reflection, Light-matter refraction, Light-matter dispersion, Light-matter absorption spectroscopy, Light-matter emission spectroscopy, Light-matter excitation spectroscopy.

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Optics, Quantum mechanics, Materials science, Light-matter interaction, Electromagnetic radiation, Photonics, Photovoltaics, Solar energy, Quantum computing, Quantum information, Light-matter scattering, Light-matter absorption, Light-matter emission, Light-matter excitation, Light-matter annihilation, Light-matter recombination, Light-matter interference, Light-matter diffraction, Light-matter polarization, Light-matter reflection, Light-matter refraction, Light-matter dispersion, Light-matter absorption spectroscopy, Light-matter emission spectroscopy, Light-matter excitation spectroscopy.
5.1 Foundations Up until now, we have only considered light propagating essentially in vacuum; this has been used as the basis to describe the effects of reflection, refraction, and transmission in a medium. These essentially passive phenomena, alone, serve as a reminder that nothing is achieved with light, or learned about it, without material interaction. However, a more extensive realm of science centers upon light actively coupling with matter - and many of the systems, in which the photonic aspects of light are most clearly manifest, concern matter in the form of atoms, molecules, or nanoparticles. A quantum analysis of light–matter interactions typically begins with the system Hamiltonian H, the energy operator of the system. In basic quantum mechanics, the "system" simply comprises matter, and the state wavefunctions are secured as eigenstates of the corresponding Hamiltonian Hmat. A quantum formulation of the radiation requires the additional inclusion of a radiation Hamiltonian Hrad. Here, it becomes appropriate to use the representation of quantum electrodynamics (QED): however, because the charges that comprise matter move at significantly sub-luminal speeds in almost all optics and photonics applications, the full relativistic form of QED is unnecessary. To complete the full Hamiltonian for systems in which light and matter are not isolated from each other, an interaction Hamiltonian Hint is also required. The system Hamiltonian can thus be decomposed into three parts: [41]
Ever splitting the light! How often do they strive to divide that which, despite everything, would always remain single and whole. Goethe (quoted in Zajonc 1993) Introduction The use of electromagnetic wave theory and geometrical optics to describe propagation of light is satisfactory when there is no exchange of energy between radiation and matter. All observable characteristics – direction of propagation, polarization, diffraction, interference, the energy of radiation, and so forth – are accurately described by one of these so-called classical theories. However, with the exception of absorption by lossy media (eqn. 4.36) or the effects of dispersion (eqn. 4.22), classical theories fail to give reasons for many phenomena that have practical consequences in modern technology and that involve interaction between radiation and matter. Even the partially successful descriptions of dispersion or loss cannot explain the existence of the multitude of spectrally distinct absorption lines; cannot predict the wavelengths for absorption or the wavelengths for anomalous dispersion; cannot account for all the absorbed energy; and, most importantly, cannot predict or describe the effect of optical gain, which is closely related to absorption. Thus, the principles of operation of many important devices of modern optics such as lasers, photodiodes, electronic cameras, and television screens cannot be explained by classical theories. Even the emission by the sun or an incandescent lamp are beyond the scope of these theories. It is evident therefore that a new, modern theory is necessary – one that is either more complete than, or simply complements, the classical theories.
Abstract Eu³⁺-doped borate and phosphate glasses were synthesized by the conventional melt-quenching technique and investigated as potential materials for quantum photonic and solid-state quantum computing applications. X-ray diffraction analysis confirmed the highly amorphous and isotropic nature of the prepared glasses, providing favorable conditions for coherent photon propagation with minimal scattering losses. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) revealed homogeneous morphology and uniform distribution of Eu³⁺ ions, which are essential for stable light–matter interactions and optical qubit confinement. Physical and optical characterization demonstrated distinct advantages for both glass systems. Borate glasses exhibited higher density, refractive index, field strength, and optical confinement, indicating enhanced photon localization and stronger light–matter interactions suitable for integrated quantum photonic circuits. In contrast, phosphate glasses showed superior rare-earth ion solubility, improved ion dispersion, reduced concentration quenching, and greater spectral stability, making them promising candidates for optical quantum memory and photon-buffering applications. Optical absorption and photoluminescence studies revealed intense Eu³⁺ radiative transitions, particularly the hypersensitive ⁵D₀ → ⁷F₂ transition near 612 nm, confirming strong electric-dipole interactions and efficient quantum optical emission behavior. Judd–Ofelt analysis indicated enhanced asymmetry and covalent bonding around Eu³⁺ ions, resulting in increased radiative transition probabilities, optical gain, and stimulated emission characteristics. These properties are highly beneficial for coherent optical amplification, photon manipulation, and photonic qubit operations. The combined structural, physical, and spectroscopic results demonstrate that Eu³⁺-activated borate and phosphate glasses possess the characteristics required for rare-earth-based quantum emitters, optical quantum memory devices, integrated photonic circuits, quantum sensors, and solid-state quantum computing architectures. The study establishes both glass systems as promising multifunctional platforms for emerging quantum photonic technologies and advanced quantum information processing applications.
Nonlinear optics normally involves the change in the susceptibility of a material due to the presence of optical radiation. In many cases, the light-matter interaction produces a change in the refractive index of the medium, as occurs in photorefractive media, as well as in Kerr-like media, Brillouin-active media and absorbing media with thermallyinduced refractive index changes. Such nonlinear refractive index variation corresponds to a change in the real part of the optical susceptibility %. In resonant materials, the optical radiation induces stimulated emission (or absorption) causing transfer of population between different energy states of the medium. This can lead to saturation of the amplification (or absorption) corresponding to changes in the imaginary part of the susceptibility x= i2odk where the amplitude gain coefficient a(I) is a saturable function of the intensity /, and k is the magnitude of the wavevector of the optical radiation. The interference of two (or more) coherent beams I(x) in the laser amplifier can cause a modulation of the population inversion N(x). This modulation of the inversion is commonly known as spatial hole burning in lasers and leads to formation of a gain-grating a(x) = 1/2GN(X) where G is the stimulated emission cross-section. The gain grating can act as a very efficient diffractive optical element exhibiting high diffraction efficiency that may be even greater than unity [16] and also very high phase conjugate reflectivity using four-wave mixing (FWM) geometries [5-7].