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Second harmonic generation of centrosymmetric nanospheres excited by tightly-focused doughnut beams
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Using the vector diffraction theory and the phenomenological model, this paper investigates the second harmonic generation (SHG) of a single centrosymmetric nanosphere excited by focused doughnut beams (DBs) with different topological charges. The results show that strong backward SHG (BSHG) appears when the particle is excited by focused DBs with topological charges of . The backward second harmonic radiation can be caused by the depolarized effect of high numerical aperture (NA) objectives due to the strong longitudinal components. 相似文献
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本文使用理论与实验相结合的方法研究了斜入射下液晶涂布型C-plate(Liquid crystal coated C-plate, LCC)对逆分散1/4波片(Reverse wavelength dispersion quarter wave plate, RQWP)补偿能力的优化特性。使用扩展琼斯矩阵比较了偏振光以任意角度通过RQWP、RQWP+LCC两种架构后出射光的椭圆率,探究了不同相位延迟RTH的LCC对出射光椭圆率的影响;测试了上述两种架构的圆偏光片在OLED(Organic light emitting-diode display)上的环境光反射率以及反射颜色色坐标。结果表明,LCC能够使45°斜入射时出射光的椭圆率提升10%以上,且在红、绿、蓝三色光条件下,调整LCC的RTH可使膜材架构的总折射率系数NZ趋近于0.5,获得最佳效果。使用RQWP+LCC架构的圆偏光片可使45°极角下OLED的环境光反射率降低3%。在工业生产中直接生产NZ=0.5的膜材拥有较高的技术难度,本文结论对开发NZ=0.5的膜材提供了新的可行方案。 相似文献
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