I address the question of whether the bidirectional reflectance distribution function (BRDF) of a structured surface has the same value when the incident and reflected angles are reversed. In particular, I examine the validity of some recent counterexamples and contrary measurements. On the basis of a new definition for structured surfaces, I conclude that the BRDF should be reciprocal. I show that designed counterexamples are flawed and suggest that measurements that do not exhibit reciprocity can be attributed to uncertainty and uncontrolled factors.
© 2002 Optical Society of America
(030.5620) Coherence and statistical optics : Radiative transfer
(030.5630) Coherence and statistical optics : Radiometry
(030.5770) Coherence and statistical optics : Roughness
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
William C. Snyder, "Structured Surface Bidirectional Reflectance Distribution Function Reciprocity: Theory and Counterexamples," Appl. Opt. 41, 4307-4313 (2002)