The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin, 300457, China.
Sci Rep. 2017 May 24;7(1):2361. doi: 10.1038/s41598-017-02504-7.
We achieved high visibility first-order subwavelength interference based on light pulse storage and retrieval technique via electromagnetically induced transparency (EIT) effect in a Pr:YSiO crystal. The interference field distribution of a double-slit was first stored in a Pr:YSiO crystal based on EIT effect, and then it was read out by a spatially modulated readout beam. The retrieved output field is proportional to the product of the input interference field of the double-slit and the spatially modulated readout field. High visibility first-order subwavelength interference with an effective wavelength of λ/n, where λ is the wavelength of the input light field and n is any positive integer, can be obtained by designing the spatial modulation structure of the readout field. Experimentally, first-order subwavelength interference with an effective wavelength of λ/3 and a visibility of 67% were demonstrated. Such first-order subwavelength interference has important applications on high resolution optical lithography.
我们通过在 Pr:YSiO 晶体中基于电磁感应透明（EIT）效应的光脉冲存储和检索技术实现了基于光脉冲存储和检索技术的高可见度一级亚波长干涉。首先，基于 EIT 效应，将双缝的干涉场分布存储在 Pr:YSiO 晶体中，然后通过空间调制读出光束将其读出。读出的输出场与双缝的输入干涉场和空间调制读出场的乘积成正比。通过设计读出场的空间调制结构，可以获得有效波长为 λ/n 的高可见度一级亚波长干涉，其中 λ 是输入光场的波长，n 是任何正整数。实验上，演示了有效波长为 λ/3 和可见度为 67%的一级亚波长干涉。这种一级亚波长干涉在高分辨率光学光刻中有重要的应用。
