Nonlinear Optical Processes in Optically Trapped InP Nanowires

作者：Wang Fan; Reece Peter J^*; Paiman Suriati; Gao Qiang; Tan Hark Hoe; Jagadish Chennupati

来源：Nano Letters, 2011, 11(10): 4149-4153.

DOI：10.1021/nl2020262

• semiconductor nanowires
• photoluminescence
• optical tweezers
• multi-photon absorption
• second harmonic generation

We report on the observation of nonlinear optical excitation and related photoluminescence from single InP semiconductor nanowires held in suspension using a gradient force optical tweezers. Photoexcitation of free carriers is achieved through absorption of infrared (1.17 eV) photons from the trapping source via a combination of two- and three-photon processes. This was confirmed by power-dependent photoluminescence measurements. Marked differences in spectral features are noted between nonlinear optical excitation and direct excitation and are related to band-filling effects. Direct observation of second harmonic generation in trapped InP nanowires confirms the presence of nonlinear optical processes.

• 出版日期2011-10