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<p>This paper provides an analytical model for a modified double ring resonator (MDRR) in the Z-domain, with particular emphasis on its applications in optical filtering, high-precision biosensing and modulation. The presented dual-output MDRR structure offers improved free spectral range (FSR) of around 6.1 THz from the two drop-channels and small linewidth, making it ideal for high-quality optical filtering. Furthermore, we explore the device as a high precision biosensor, attaining a sensitivity, Q-factor and figure of merit of 887.26 nm/RIU, 526.04 and 256.801 RIU<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11082_2025_8237_Article_IEq1.gif" Format="GIF" Height="11" Rendition="HTML" Resolution="72" Type="Linedraw" Width="18" /> </InlineMediaObject> <EquationSource Format="TEX">\(^{-1}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation> respectively. Finally, we evaluate its functionality as a modulator, highlighting the versatility of the MDRR configuration in advancing integrated photonics, providing advanced solutions for next-generation optical communication technologies.</p>

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Modeling and Z-domain analysis of a modified double ring resonator for optical filtering, high-precision biosensing and modulation

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • Aman Shekhar,
  • Sanjoy Mandal

摘要

This paper provides an analytical model for a modified double ring resonator (MDRR) in the Z-domain, with particular emphasis on its applications in optical filtering, high-precision biosensing and modulation. The presented dual-output MDRR structure offers improved free spectral range (FSR) of around 6.1 THz from the two drop-channels and small linewidth, making it ideal for high-quality optical filtering. Furthermore, we explore the device as a high precision biosensor, attaining a sensitivity, Q-factor and figure of merit of 887.26 nm/RIU, 526.04 and 256.801 RIU \(^{-1}\) - 1 respectively. Finally, we evaluate its functionality as a modulator, highlighting the versatility of the MDRR configuration in advancing integrated photonics, providing advanced solutions for next-generation optical communication technologies.