Mohammadi Elham, Ghaffari Mohammad, Behdad Nader
University of Wisconsin-Madison, Department of Electrical and Computer Engineering, Madison, WI, 53706, USA.
Sci Rep. 2020 Feb 12;10(1):2488. doi: 10.1038/s41598-020-59440-2.
We present a new technique for designing angle-sensing, long-wave infrared (LWIR) detectors. Angle detection in the proposed detector is achieved by measuring the ratio of the absorbed power in two closely-spaced, directive infrared antennas. Each directive LWIR antenna is in the form of a three-element Yagi-Uda array sharing a common reflector element with its neighbor. The structure of each antenna is optimized to act both as the collector of the infrared energy from the desired direction and as a distributed bolometer that senses the received radiation. The resistivity of each bolometer-antenna changes as a function of the absorbed power by the antenna. This change of resistance is sensed by biasing each antenna with a constant DC voltage and measuring the change of current passing through the antenna. Following this approach, by measuring the ratio of the resistance change in the two antennas, the angle of arrival of the LWIR signal can be determined. We present the design, fabrication, and measurement results of an angle-sensing detector optimized to operate at the wavelength of λ = 10.6 μm. The proposed detector has subwavelength dimensions occupying an aperture having dimensions of approximately 0.6 λ × 0.4λ. The response of the detector was measured and shows the angle sensing dynamic range of 22 dB within the field of view of ±60°.
我们提出了一种用于设计角度传感长波红外（LWIR）探测器的新技术。在所提出的探测器中，角度检测是通过测量两个紧密间隔的定向红外天线中吸收功率的比率来实现的。每个定向LWIR天线采用三单元八木 - 宇田阵列的形式，与其相邻天线共享一个公共反射器元件。每个天线的结构经过优化，既可以作为从所需方向收集红外能量的收集器，又可以作为检测接收到的辐射的分布式测辐射热计。每个测辐射热计天线的电阻率会随着天线吸收功率的变化而变化。通过用恒定直流电压对每个天线进行偏置并测量流过天线的电流变化来检测这种电阻变化。按照这种方法，通过测量两个天线中电阻变化的比率，可以确定LWIR信号的到达角度。我们展示了一个优化为在波长λ = 10.6μm下工作的角度传感探测器的设计、制造和测量结果。所提出的探测器具有亚波长尺寸，占据一个尺寸约为0.6λ×0.4λ的孔径。对探测器的响应进行了测量，结果表明在±60°的视场内角度传感动态范围为22dB。
