Scholarlink

<p>Potential for single-photon mm-wave detection by antenna-coupled Pb–graphene–Pb Josephson junctions (JJ) is evaluated. We consider the high-speed “video” (non-thermal) detection based on Shapiro steps induced by antenna-sourced AC currents across the JJ. Electrodynamic simulation informs the bowtie antenna design and estimates the AC current through JJ. Standard JJ models are used to estimate the corresponding AC voltage and the downward shift of the maximum zero-voltage DC current I<sub>c</sub>, where a sharp transition occurs in the DC voltage–current curve. Calculated voltage responsivity for current biasing near I<sub>c</sub> is compared with Johnson noise to estimate a lower limit for noise equivalent photon flux. Estimated responsivity is 0.9 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(MV/W\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>M</mi> <mi>V</mi> <mo stretchy="false">/</mo> <mi>W</mi> </mrow> </math></EquationSource> </InlineEquation> at 300 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(GHz\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="italic">GHz</mi> </mrow> </math></EquationSource> </InlineEquation>, and the lower bound on the noise equivalent power is 0.11 fW/<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\sqrt {{\text{Hz}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msqrt> <mtext>Hz</mtext> </msqrt> </math></EquationSource> </InlineEquation> giving a 2 photons per microsecond.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Electrodynamic simulation of an antenna-coupled Pb–graphene–Pb Josephson junction at millimeter wavelengths

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月19日

查看全文
  • Emily Frederick,
  • Swastik Ballav,
  • Javier Gonzalez,
  • R. E. Peale,
  • Masa Ishigami

摘要

Potential for single-photon mm-wave detection by antenna-coupled Pb–graphene–Pb Josephson junctions (JJ) is evaluated. We consider the high-speed “video” (non-thermal) detection based on Shapiro steps induced by antenna-sourced AC currents across the JJ. Electrodynamic simulation informs the bowtie antenna design and estimates the AC current through JJ. Standard JJ models are used to estimate the corresponding AC voltage and the downward shift of the maximum zero-voltage DC current Ic, where a sharp transition occurs in the DC voltage–current curve. Calculated voltage responsivity for current biasing near Ic is compared with Johnson noise to estimate a lower limit for noise equivalent photon flux. Estimated responsivity is 0.9 \(MV/W\) M V / W at 300 \(GHz\) GHz , and the lower bound on the noise equivalent power is 0.11 fW/ \(\sqrt {{\text{Hz}}}\) Hz giving a 2 photons per microsecond.

Graphical abstract