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<p>Theoretical demonstration of excitation of electromagnetic surface waves (EMSWs) via Bragg grating coupler is presented. The present manuscript utilizes the improvised Kretschmann configuration coupling mechanism where the prism is replaced by a dielectric Bragg grating. The sensing performance based on the resonance excitation of EMSWs is studied for transverse magnetic polarized (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12596_2025_2955_Article_IEq1.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="31" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:\pi\:-\)</EquationSource> </InlineEquation>polarized waves) case. The dispersive properties and the optical properties are also studied. For the designed sensor the refractive index sensitivity is evaluated to be <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12596_2025_2955_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="115" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:31.55\:\mu\:m/RIU\)</EquationSource> </InlineEquation> and the angular sensitivity is evaluated to be <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12596_2025_2955_Article_IEq3.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="117" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:0.2194\:\:\mu\:m/deg\)</EquationSource> </InlineEquation>. Such photonic structure is novel compared to the traditional way of sensing under Kretschmann configuration because it leads to the miniaturization of the sensors which makes it compact and easily portable.</p>

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Design of mid-IR sensor based on resonance excitation of bloch surface wave through a Bragg grating

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Mahendra Kumar,
  • Surendra Prasad

摘要

Theoretical demonstration of excitation of electromagnetic surface waves (EMSWs) via Bragg grating coupler is presented. The present manuscript utilizes the improvised Kretschmann configuration coupling mechanism where the prism is replaced by a dielectric Bragg grating. The sensing performance based on the resonance excitation of EMSWs is studied for transverse magnetic polarized ( \(\:\pi\:-\) polarized waves) case. The dispersive properties and the optical properties are also studied. For the designed sensor the refractive index sensitivity is evaluated to be \(\:31.55\:\mu\:m/RIU\) and the angular sensitivity is evaluated to be \(\:0.2194\:\:\mu\:m/deg\) . Such photonic structure is novel compared to the traditional way of sensing under Kretschmann configuration because it leads to the miniaturization of the sensors which makes it compact and easily portable.