We propose two terahertz reflectometry modalities, optimized to be sensitive to the curvature of surface features. A dark-field approach yields higher sensitivity whilst the out-of-focus technique allows one to distinguish between convex and concave shapes.
© 2004 Optical Society of America
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1220) Diffraction and gratings : Apertures
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
N. Hasegawa, K. Rönnburg, A. Lisauskas, M. Thomson, T. Löffler, and H. G. Roskos, "Surface-structure identification using THz radar techniques with spatial beam filtering and out-of-focus detection," in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2004), paper CThT22.
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