High-absorption optical stack for aluminum kinetic inductance detectors

Mai，Zhanzhang1; Dai，Xucheng1; Chen，Yingni1; Shi，Zhongyu1; Wang，Haoyu2,3; Pan，Changzhao2,3; Liu，Xuming2,3; Wang，Zhao2,3; Guo，Weijie2,3; Wang，Yiwen1

2023-07-01

10.1364/AO.493305

Applied Optics   Impact Factor & Quartile

1559-128X

2155-3165

We present a high-absorption optical stack design for aluminum (Al) kinetic inductance detectors (KIDs). Aluminum can be easily processed in micro-fabrication and is the most conventional superconducting material for KIDs.However, it is challenging to achieve high absorption in the Al absorber because of its high reflection at optical wavelengths. By embedding the thin Al film between an anti-reflection (AR) coating layer and a dielectric-based distributed Bragg reflector, we show that close-to-unity absorption can be achieved around a single wavelength (e.g.,≈98.9% at 1518 nm). The reflection and transmission measurements agreewell with the calculation based on the transmission matrix model.We also show our preliminary results of absorption ≥70% in a broader wavelength range (≈230 nm) with multilayer AR coatings. The absorber design in a lumped-element KID is discussed. Our work paves the way to high-efficiency photon-counting and energy-resolving Al-based KIDs in the optical to NIR range.

SCI

English

Corresponding

WOS:001032765700002

PHYSICS

2-s2.0-85164278095

Scopus

1.Quantum Optoelectronics Laboratory,School of Physics Science and Technology,Southwest Jiaotong University,Chengdu,610031,China
2.Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.International Quantum Academy,Shenzhen,518048,China

Mai，Zhanzhang,Dai，Xucheng,Chen，Yingni,et al. High-absorption optical stack for aluminum kinetic inductance detectors[J]. Applied Optics,2023,62(19):5294-5300.

Mai，Zhanzhang.,Dai，Xucheng.,Chen，Yingni.,Shi，Zhongyu.,Wang，Haoyu.,...&Wang，Yiwen.(2023).High-absorption optical stack for aluminum kinetic inductance detectors.Applied Optics,62(19),5294-5300.

Mai，Zhanzhang,et al."High-absorption optical stack for aluminum kinetic inductance detectors".Applied Optics 62.19(2023):5294-5300.