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Applied Optics

Applied Optics


  • Vol. 37, Iss. 16 — Jun. 1, 1998
  • pp: 3464–3470

Thermodynamic constraints on reflectance reciprocity and Kirchhoff’s law

William C. Snyder, Zhengming Wan, and Xiaowen Li  »View Author Affiliations

Applied Optics, Vol. 37, Issue 16, pp. 3464-3470 (1998)

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Contrary to common belief, neither reciprocity of the bidirectional reflectance distribution function (BRDF) nor the directional form of Kirchhoff’s electromagnetic radiation law can be demonstrated on the basis of energy conservation. The BRDF is generally considered reciprocal as an extension of Helmholtz reciprocity, but Helmholtz reciprocity does not always hold. We describe the flaw in a thermodynamic demonstration of reciprocity that uses an enclosure calculation. Some conclusions can be drawn from the enclosure calculation, but reciprocity requires more restrictive conditions. We conclude that, although they can be violated, reciprocity and the directional form of Kirchhoff’s law generally hold because of the quantum-mechanical principle of time-reversal invariance, which applies to most materials.

© 1998 Optical Society of America

OCIS Codes
(000.6850) General : Thermodynamics
(120.5630) Instrumentation, measurement, and metrology : Radiometry

Original Manuscript: July 21, 1997
Revised Manuscript: January 20, 1998
Published: June 1, 1998

William C. Snyder, Zhengming Wan, and Xiaowen Li, "Thermodynamic constraints on reflectance reciprocity and Kirchhoff’s law," Appl. Opt. 37, 3464-3470 (1998)

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