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Abstract <p>The well-known characteristics of photodetectors including responsivity, noise equivalent power and detectivity are relevant for devices with dimensions larger than the wavelength. In this paper, we derive physically relevant merits for two-dimensional subwavelength photodetectors, for example, based on small flakes of graphene or transition metal chalcogenides. The frequently used current/voltage responsivity of a subwavelength detector with power normalized to the device area can be achieved by fabricating multiple identical detectors and combining them into parallel or sequential arrays. Noise equivalent power with power normalized to the device area is not achieved with any combination of detectors. Instead, with an optimal array size, a value greater by a factor of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(2w{\text{/}}a\)</EquationSource> <!--MicElec2560168Svintsov-m1--> </InlineEquation> is achieved, where <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(w\)</EquationSource> <!--MicElec2560168Svintsov-m2--> </InlineEquation> is the optical spot size and <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(a\)</EquationSource> <!--MicElec2560168Svintsov-m3--> </InlineEquation> is the size of an individual detector. The noise equivalent power of a subwavelength array decreases with area as <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({{A}^{{ - 1/2}}}\)</EquationSource> <!--MicElec2560168Svintsov-m4--> </InlineEquation> for arrays with a large effective surface impedance, and as <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\({{A}^{{ - 3/2}}}\)</EquationSource> <!--MicElec2560168Svintsov-m5--> </InlineEquation> for arrays with a small effective surface impedance.</p>

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Physically Relevant Merits of Two-Dimensional Subwavelength Photodetectors

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • D. Svintsov,
  • D. Mylnikov,
  • A. Bocharov

摘要

Abstract

The well-known characteristics of photodetectors including responsivity, noise equivalent power and detectivity are relevant for devices with dimensions larger than the wavelength. In this paper, we derive physically relevant merits for two-dimensional subwavelength photodetectors, for example, based on small flakes of graphene or transition metal chalcogenides. The frequently used current/voltage responsivity of a subwavelength detector with power normalized to the device area can be achieved by fabricating multiple identical detectors and combining them into parallel or sequential arrays. Noise equivalent power with power normalized to the device area is not achieved with any combination of detectors. Instead, with an optimal array size, a value greater by a factor of \(2w{\text{/}}a\) is achieved, where \(w\) is the optical spot size and \(a\) is the size of an individual detector. The noise equivalent power of a subwavelength array decreases with area as \({{A}^{{ - 1/2}}}\) for arrays with a large effective surface impedance, and as \({{A}^{{ - 3/2}}}\) for arrays with a small effective surface impedance.