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arXiv · 1612.01677

High-resolution Collinear Chiral Sum Frequency Generation Microscopy by Using Vectorial Beam

Ziheng Ji·Wentao Yu·Hong Yang·Kaihui Liu·Qihuang Gong·Zhiwen Liu·Kebin Shi
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Abstract

In chiral sum frequency generation (C-SFG), the chiral nature of ${\chi}^{(2)}$ requires the three involved electric fields to be pairwise non-parallel, leading to the traditional non-collinear configuration which is a hindrance for achieving diffraction limited resolution while utilizing it as a label-free imaging contrast mechanism . Here we propose a collinear C-SFG (CC-SFG) microscopy modality by using longitudinal z-polarized vectorial field. Label-free chiral imaging with enhanced spatial resolution (~1.4 times improvement in one lateral and the longitudinal directions over the traditional non-collinear scheme) is demonstrated, providing a new path for SFG microscopy with diffraction-limited resolution for mapping chirality.

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Ziheng Ji, Wentao Yu, Hong Yang, Kaihui Liu, Qihuang Gong, Zhiwen Liu, Kebin Shi. 2016-12-06. High-resolution Collinear Chiral Sum Frequency Generation Microscopy by Using Vectorial Beam. https://arxiv.org/abs/1612.01677

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