太赫兹强度测绘仪用动力学电感探测器的千像素性能
Kilopixel Performance of the Kinetic Inductance Detectors for the Terahertz Intensity Mapper
- University of California, Los Angeles（加州大学洛杉矶分校）
- California Institute of Technology（加州理工学院）
- Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）
- Arizona State University（亚利桑那州立大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究表征了TIM项目864像素LEKID阵列中490个谐振器的性能，验证了其在千像素规模下达到光子噪声限制灵敏度，中位NEP为1.1e-17 W/√Hz，光学效率约0.67，主要挑战在于音调优化与谐振器跟踪。
AI中文摘要：
我们表征了为太赫兹强度测绘仪（TIM）长波模块开发的飞行级集总元件动力学电感探测器（LEKID）阵列。从一个864像素的科学阵列中，我们选取了490个覆盖焦平面和读出频带的良好隔离谐振器，并使用拟用于飞行的基于ZCU111的多音读出系统测量了其热响应、光学响应度和噪声。探测器群体的热和光学响应与之前的单像素测量一致，并可在库珀对或准粒子密度变化的影响下用Mattis-Bardeen理论描述。在增加黑体负载下，所测噪声从热产生-复合主导的底噪转变为光子噪声限制的标度，大多数探测器在约400 fW入射功率下达到光子噪声限制运行，中位探测器噪声限制的噪声等效功率（NEP）为$NEP_{det} = 1.1\times10^{-17} W \sqrt{Hz}$。所测光子噪声标度意味着中位光学效率约为0.67，表明探测器和黑体辐射体之间存在额外的未知损耗源，初步归因于波导中的损耗。这些结果表明，TIM LEKID架构在扩展到千像素级阵列时保持了所需的灵敏度；主要剩余挑战是阵列级音调优化、谐振器跟踪和频域碰撞的识别。
英文摘要：
We characterize a flight-grade array of lumped-element kinetic inductance detectors (LEKIDs) developed for the long-wavelength module of the Terahertz Intensity Mapper (TIM). From an 864-pixel science array, we select 490 well-isolated resonators spanning the focal plane and readout band and measure their thermal response, optical responsivity, and noise using a ZCU111-based multitone readout system intended for flight. The thermal and optical response of the detector population is consistent with previous single-pixel measurements and can be described by Mattis-Bardeen theory under the influence of a change in Cooper pair or quasi-particle density. Under increasing blackbody loading, the measured noise transitions from a thermal generation-recombination-dominated floor to photon-noise-limited scaling, with the majority of detectors achieving photon-noise-limited operation by approximately 400 fW incident power, with a median detector noise-limited NEP of $NEP_{det} = 1.1\times10^{-17} W \sqrt{Hz}$. The measured photon-noise scaling implies a median optical efficiency of approximately 0.67, indicating additional unknown loss sources between the detectors and blackbody radiator, tentatively attributed to losses in the waveguide. These results demonstrate that the TIM LEKID architecture retains the required sensitivity when scaled to kilopixel-class arrays; the principal remaining challenges are array-level tone optimization, resonator tracking, and identification of frequency-domain collisions.
