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<p>Spatially periodic index modulations and effective photonic unit cells are controlled and modified by the absorption and dispersion spectra of birefringent beams of light. This is achieved through the application of coupled driving fields and cavity coupling with a chiral atomic medium. The absorption and dispersion spectra of these birefringent beams carry the information of the localization of spatially periodic index modulations and effective photonic unit cells, which are extracted from their variation across various positions. Two distinct localized oscillations and images of tetragonal-like effective photonic unit cells are controlled in the valley region by simultaneous dispersion spectra. Additionally, one clear cubic type unit cell is obtained by simultaneous absorption spectra of left and right circularly polarized (LCP/RCP) beams of light interacting in a chiral atomic medium. The effective unit cells characterized by dimensions of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(a=0.6\lambda \)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(b=0.4\lambda \)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(c=0.4\lambda \)</EquationSource> </InlineEquation> with angles <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\alpha ,\beta , \theta =90^o\)</EquationSource> </InlineEquation> are controlled by dispersion spectra. In contrast, effective unit cells with dimensions of <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(a=0.4\lambda \)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(b=0.4\lambda \)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(c=0.4\lambda \)</EquationSource> </InlineEquation> and with angles <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\alpha ,\beta ,\theta =90^o\)</EquationSource> </InlineEquation> are controlled through the simultaneous absorption spectra of LCP and RCP beams in a chiral atomic medium. These modified and controlled effective photonic unit cells have substantial applications in waveguides and optical communication technologies.</p>

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Coherent control of photonic lattice unit cells using chiral atomic medium coupled with a cavity

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Latif Ur Rahman,
  • U. Zakir,
  • Mukhtar Y. Y. Abdalla,
  • Naglaa Mohammed,
  • Huda M. Almabadi

摘要

Spatially periodic index modulations and effective photonic unit cells are controlled and modified by the absorption and dispersion spectra of birefringent beams of light. This is achieved through the application of coupled driving fields and cavity coupling with a chiral atomic medium. The absorption and dispersion spectra of these birefringent beams carry the information of the localization of spatially periodic index modulations and effective photonic unit cells, which are extracted from their variation across various positions. Two distinct localized oscillations and images of tetragonal-like effective photonic unit cells are controlled in the valley region by simultaneous dispersion spectra. Additionally, one clear cubic type unit cell is obtained by simultaneous absorption spectra of left and right circularly polarized (LCP/RCP) beams of light interacting in a chiral atomic medium. The effective unit cells characterized by dimensions of \(a=0.6\lambda \) , \(b=0.4\lambda \) , \(c=0.4\lambda \) with angles \(\alpha ,\beta , \theta =90^o\) are controlled by dispersion spectra. In contrast, effective unit cells with dimensions of \(a=0.4\lambda \) , \(b=0.4\lambda \) , \(c=0.4\lambda \) and with angles \(\alpha ,\beta ,\theta =90^o\) are controlled through the simultaneous absorption spectra of LCP and RCP beams in a chiral atomic medium. These modified and controlled effective photonic unit cells have substantial applications in waveguides and optical communication technologies.