Emission Direction‐Tunable Liquid Crystal Laser,Advanced Optical Materials

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Emission Direction‐Tunable Liquid Crystal Laser
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-05-25 , DOI: 10.1002/adom.202000375
SeongYong Cho ₁ , Hiroyuki Yoshida ₁ , Masanori Ozaki ₁

Affiliation

Photonic crystal lasers possessing tailored lasing characteristics have attracted significant attention for various applications such as holography, optical communications, and LiDARs. Liquid‐crystal‐based photonic crystals are actively investigated to realize tunable lasers capable of controlling the emission wavelength, but it is a challenge to realize lasers with the capability to tune the emission direction. Here, a photonic band‐edge laser with tunable output direction is reported based on an engineered cholesteric liquid crystal with a slanted helical structure. In addition to the modulation of the director along the helical axis of the liquid crystal, a fine‐pitch modulation is introduced in the direction perpendicular to the helical axis, so that the photonic band‐edge is shifted away from the helical axis. By doping a dye in the liquid crystal, a microlaser that emits at an angle of ≈30° to the surface normal is realized. Further, control of the emission angle is achieved by modulating the periodicity of the photonic structure by an external stimulus. This work shows that organic microlasers with inexpensive fabrication methods can be engineered to possess advanced functionality such as beam‐scanning.

中文翻译：

发射方向可调液晶激光器

具有定制激光特性的光子晶体激光器已在各种应用（例如全息，光通信和LiDAR）中引起了极大的关注。对基于液晶的光子晶体进行了积极的研究，以实现能够控制发射波长的可调谐激光器，但是实现具有能够调谐发射方向的激光器是一个挑战。在此，据报道，基于具有倾斜螺旋结构的工程胆甾型液晶，具有可调输出方向的光子带边缘激光器。除了沿液晶的螺旋轴对指向矢进行调制以外，还沿垂直于螺旋轴的方向引入了细调调制，从而使光子带边缘偏离了螺旋轴。通过将染料掺杂到液晶中，可以实现以与表面法线成约30°的角度发射的微激光。此外，通过外部刺激来调制光子结构的周期性，从而实现对发射角的控制。这项工作表明，可以使用廉价的制造方法对有机微激光器进行工程设计，使其具有光束扫描等先进功能。

更新日期：2020-05-25

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