Abstract
ZnO has attracted more and more interesting for its wide applications in optoelectronic devices based on the high room temperature light emission efficiency and very good crystalline quality. On the other hand, ZnO has non-centrosymmetric structure, so it also showed outstanding properties in nonlinear optical processes such as the second harmonic generation (SHG) and two photon excitation (TPE). Nonlinear optical processes can achieve high special resolution and high quality imaging because of the longer penetration length and smaller focus volume in the applications of bio-environment. The longer wavelength near infrared incident light will infiltrate deeper into the material, resulting in the construction of 3-D imaging as well as avoiding the light scattering and auto florescence which limited the resolution for Florescence microscope
© 2016 Japan Society of Applied Physics, Optical Society of America
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