Affiliation:
1. Southwest Jiaotong University
2. International Quantum Academy
Abstract
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 agree well with the calculation based on
the transmission matrix model. We also show our preliminary results of
absorption ≥70% in a broader wavelength range (≈230nm) 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.
Funder
National Natural Science Foundation of
China
National Key Research and Development
Program of China
Natural Science Foundation of Sichuan
Province
Basic and Applied Basic Research
Foundation of Guangdong Province
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
1 articles.
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