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Electromagnetic characteristics of single-walled finite-length carbonnanotubes - absorption cross-section and field enhancement in the near zone -are theoretically studied in a wide frequency range from terahertz to visible.The analysis is based on the impedance-type effective boundary conditions andthe integral equation technique. Comparison with experimental results iscarried out allowing qualitative physical interpretation of low-frequency(far-IR and terahertz) absorption band observed in experiments. Potentiality ofCNTs for the IR photothermolysis of living cells is discussed. Strong localfield enhancement is predicted to be inherent to metallic CNTs in thenear-field zone providing necessary mechanism for far-IR and terahertznear-field optics.

Absorption Cross-Section and Near-Field Enhancement in Finite-Length Carbon Nanotubes in the Terahertz-to-Optical Range