Withington Stafford, Thomas Christopher N
Cavendish Laboratory, JJ Thompson Avenue, Cambridge, CB3 OHE, UK.
J Opt Soc Am A Opt Image Sci Vis. 2009 Jun;26(6):1382-92. doi: 10.1364/josaa.26.001382.
Free-space power detectors often have energy absorbing structures comprising multilayer systems of patterned thin films. We show that for any system of interacting resistive films, the expectation value of the absorbed power is given by the contraction of two tensor fields: one describes the spatial state of coherence of the incoming radiation, the other the state of coherence to which the detector is sensitive. Equivalently, the natural modes of the optical field scatter power into the natural modes of the detector. We describe a procedure for determining the amplitude, phase, and polarization patterns of a detector's optical modes and their relative responsivities. The procedure gives the state of coherence of the currents flowing in the system and leads to important conceptual insights into the way the pixels of an imaging array interact and extract information from an optical field.
自由空间功率探测器通常具有由图案化薄膜的多层系统组成的能量吸收结构。我们表明，对于任何相互作用的电阻膜系统，吸收功率的期望值由两个张量场的缩并给出：一个描述入射辐射的空间相干态，另一个描述探测器敏感的相干态。等效地，光场的自然模式将功率散射到探测器的自然模式中。我们描述了一种确定探测器光学模式的幅度、相位和偏振图案及其相对响应率的程序。该程序给出了系统中流动电流的相干态，并对成像阵列的像素与光场相互作用并从中提取信息的方式产生重要的概念性见解。
