Since the discovery of carbon nanotubes (CNT), tremendous efforts have been done to control and characterize their properties [1]. To this date, however, the nonlinear optical properties of CNTs remain underexploited. Although second-harmonic generation (SHG), third-harmonic generation (THG), and four-wave mixing (FWM) techniques have been used earlier, such studies used CNT films, bulk CNT samples, CNT on substrates, or complex instrumentation [2-4]. Recent SHG microscopy measurements used to image a suspended chiral single-walled CNT proposed the possibility of SHG-based chirality detection of individual CNTs [5].
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