Abstract
The first direct measurement of the mutual coherence function of a spatially incoherent infrared beam was performed at 10.6 μm using a pair of infrared dipole nano-wire antennas that were connected to a common bolometer in the center of the pair by short lengths of coplanar strip transmission line. A spatially incoherent source was constructed by dithering a BaF2 diffuser near the focus of a CO2 laser beam. The distance from the diffuser to the nano-wire antenna pair was held constant while the distance from the focus of the laser beam to the diffuser was varied to control the effective diameter of the source. The measured bolometer signal was proportional to the magnitude of the mutual coherence function at the plane of the antennas. The experimental results were found to match the predicted performance closely. If this technology can be extended to large arrays, a form of synthetic aperture optical imaging based on the Van Cittert-Zernike theorem is possible, similar to that performed at microwave frequencies now by astronomers. This has the potential to greatly increase the angular resolution attainable with optical instruments.
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References
M. Born, and E. Wolf, Principles of optics: electromagnetic theory of propagation, interference and diffraction of light (Cambridge University Press, Cambridge; New York, 1999).
L. Mandel, and E. Wolf, Optical coherence and quantum optics (Cambridge University Press, Cambridge; New York, 1995).
J. W. Goodman, Statistical optics (Wiley, New York, 1985).
A. R. Thompson, J. M. Moran, and G. W. Swenson, Interferometry and synthesis in radio astronomy (Wiley, New York, 1986).
C.R. Vogel, Computational methods for inverse problems (Society for Industrial and Applied Mathematics, Philadelphia, 2002).
A. Yariv, Optical electronics (Holt Rinehart and Winston, New York, 1985).
P. Haguenauer, M. Severi, I. Schanen-Duport, K. Perraut-Rousselet, J-P Berger, Y. Duchene, M. Lacolle, P. Y. Kern, F. Malbet, P. Benech, Planar optics three-telescope beam combiners for astronomical interferometry. Proc. SPIE 4006, 1107–1115 (2000).
I. Codreanu, F.J. González, and G.D. Boreman, Detection Mechanisms in microstrip dipole antenna-coupled infrared detectors. Infrared Physics & Technology, 44, 155–163 (2003).
F. J. González, B. Ilic, J. Alda, and G. D. Boreman, Antenna-coupled infrared detectors for imaging applications, Selected Topics in Quantum Electronics. IEEE Journal 11, 117–120, (2005).
T. Mandviwala, B. Lail, G. Boreman, Infrared-frequency Coplanar Striplines: Design, Fabrication, and Measurement. Microwave and Optical Technology Letters, 47, 17–20 (2005).
T. Mandviwala, “Transmission lines for IR signal routing,” in Electrical Engineering, (University of Central Florida, Orlando, 2006), p. 108.
Acknowledgements
One of the authors, Javier Alda, acknowledges the financial support of the Programa de Movilidad PR2006-0006 and the Project TEC2006-01882 from the Ministerio de Educacion y Ciencia of Spain.
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Middlebrook, C., Roggemann, M., Boreman, G. et al. Measurement of the Mutual Coherence Function of an Incoherent Infrared Field with a Gold Nano-wire Dipole Antenna Array. Int J Infrared Milli Waves 29, 179–187 (2008). https://doi.org/10.1007/s10762-007-9307-8
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DOI: https://doi.org/10.1007/s10762-007-9307-8