Hybrid Standing Wave and Whispering Gallery Modes in Needle-Shaped ZnO Rods: Simulation of Emission Microscopy Images Using Finite Difference Frequency Domain Methods with a Focused Gaussian Source

作者：Kirschbrown Justin R; House Ralph L; Mehl Brian P; Parker James K; Papanikolas John M^*

来源：Journal of Physical Chemistry C, 2013, 117(20): 10653-10660.

DOI：10.1021/jp4011907

Two-photon emission microscopy is used to investigate the photoluminescence properties of individual ZnO rods. The rods are 10-20 mu m in length with a tapered cross section that varies from 1 to 2 mu m at the midpoint to several hundred nanometers at the ends. The tapered shape and hexagonal cross section result in complex optical resonator modes that lead to periodic patterns in the two-photon emission image. Finite-difference frequency domain methods using a series of excitation sources, including focused Gaussian, point dipole, and plane wave, suggest that resonator modes have both standing wave (Fabry-Perot) and whispering gallery mode character, whose relative contributions vary along the rod axis.

• 出版日期2013-5-23