Second Harmonic Generation in a KNbO3 Nanorod and Its Detection by Using a Near-field Scanning Optical Microscope

作者：Park D J; Kang P G; Jung J H; Lee H H; Choi S B^*

来源：Journal of the Korean Physical Society, 2016, 68(8): L975-L978.

DOI：10.3938/jkps.68.975

• Second harmonic generation
• Nanorod
• Near-field scanning optical microscope

We report on an observation of second harmonic generation in an individual KNbO3 nanorod by using a near-field scanning optical microscope. The second harmonic is successfully generated by irradiating with a femtosecond laser having center wavelengths of 1200, 1100, and 972 nm. Such a second harmonic yield shows a clear dependence on the incident laser polarization, where maximum yield is obtained when the incident laser polarization is parallel to the long axis of an individual nanorod. A spatially-resolved second harmonic image shows a bright spot at the edge of the nanorod, which is attributed to the elaborated intensity of both fundamental laser light and second harmonic light inside the nanowire owing to cavity-mode formation.

• 出版日期2016-4