Interference-enhanced chirality-reversible dichroism metalens imaging using nested dual helical surfaces
Interference-enhanced chirality-reversible dichroism metalens imaging using nested dual helical surfaces
复制标题
使用嵌套双螺旋表面的干涉增强手性可逆二色性超透镜成像
DOI：
10.1364/optica.418128
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发表时间：
2021-04
期刊：
影响因子：
10.4
通讯作者：
Chinhua Wang
中科院分区：
文献类型：
--
作者：
Chenqian Wang;Chinhua Wang
传统的基于螺旋结构的手征超透镜由于螺旋匹配结构中交叉圆偏振的极低转换效率而遭受低能量效率和固定手征。在这里，我们报告使用嵌套双螺旋表面的高效率和手性可逆超透镜成像。通过将一个传统的螺旋面分裂成两个参数独立可控的嵌套螺旋面，实现了高效的手征超透镜。当两个嵌套螺旋表面的相对取向以一定角度扭曲时，交叉圆偏振的转换效率（即，成像中的有效偏振分量）由于两个具有单一节距的嵌套螺旋表面之间的表面等离子体激元的相长干涉，可以显着增强一个数量级（从4.5%到45%）。此外，超透镜的手征性可以通过操纵扭转角来反转，即使表面的螺旋度不变。利用双光子激光直写进行了实验验证，并通过锁相热成像成功实现了3-5 µm红外波长范围内的手性成像。这种高效和手性可逆的超透镜的演示提供了我们认为是一种新的方法来提高手性成像效率和实际应用的设计可能性。
Conventional chiral metalenses based on helicoidal structures suffer from low energy efficiency and fixed chirality due to the extremely low conversion efficiency of cross-circular polarization in helicity-matched structures. Here, we report on high-efficiency and chirality-reversible metalens imaging using nested dual helical surfaces. The high-efficiency chiral metalenses were implemented by splitting one conventional helical surface into two nested ones with independently controllable parameters. When the relative orientations of the two nested helical surfaces were twisted at certain angles, the conversion efficiency of cross-circular polarization (i.e., the effective polarization component in imaging) could be significantly enhanced by one order of magnitude (from 4.5% to 45%) due to constructive interference of surface plasmonic polaritons between the two nested helical surfaces with a single pitch. Furthermore, the chirality of the metalens could be reversed by manipulating the twist angle even though the helicity of the surface is unchanged. Experimental verifications were performed using two-photon laser direct writing, and chiral imaging in the infrared wavelength range of 3–5 µm was successfully realized via lock-in thermography. This demonstration of the high-efficiency and chirality-reversible metalens provides what we believe is a new method to enhance chiral imaging efficiencies and the design possibilities for practical applications.
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