Mechanically Flexible and Optically Tunable Organic Crystal Resonator
Mechanically Flexible and Optically Tunable Organic Crystal Resonator
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DOI：
10.1002/adom.202101808
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发表时间：
2021-11
影响因子：
9
通讯作者：
Shuai Zhao;Hiroshi Yamagishi;Osamu Oki;Yuta Ihara;Naoki Ichiji;Atsushi Kubo;Shotaro Hayashi
中科院分区：
文献类型：
--
作者：
Shuai Zhao;Hiroshi Yamagishi;Osamu Oki;Yuta Ihara;Naoki Ichiji;Atsushi Kubo;Shotaro Hayashi
有机单晶光学谐振器即使在机械弯曲下也能保持其光学性能，这仍然是一个具有挑战性的目标。在这里，开发了第一个柔性有机晶体（FOC）作为可调谐光谐振器，作为弯曲角的函数。一种荧光π共轭分子，氰基取代寡聚（苯乙烯）s，被允许缓慢结晶，产生离散棒状微晶体（FOCCOPV）。FOCCOPV不仅可以作为纵向的高效光波导，光损耗系数为0.249 dBµm−1，还可以作为横向的Fabry‐p<s:1>型光谐振器。由于泊松效应，即晶体的横向尺寸随纵向应变的收缩而随折射率的变化，FOCCOPV的机械弯曲使共振波长向较短波区精细地调谐。机械弯曲和相关的光谱位移重复了许多周期，而不会破坏其机械和光学特性。
An organic single‐crystal optical resonator that maintains its optical performance even upon mechanical bending remains a challenging target. Here, the first flexible organic crystal (FOC) that works as a tunable optical resonator as a function of bending angle is developed. A fluorescent π‐conjugated molecule, cyano‐substituted oligo(phenylenevinylene)s, is allowed to crystallize slowly, yielding a discrete rod‐shape microcrystal (FOCCOPV). FOCCOPV not only works as an efficient optical waveguide along its longitudinal direction with the optical loss coefficient of 0.249 dB µm−1 but also works as a Fabry‐Pérot type optical resonator along its lateral direction. The resonance wavelength is finely tunable toward the shorter wavelength region by the mechanical bending of FOCCOPV plausibly due to the Poisson effect, namely, the contraction of the lateral dimension of the crystal by the longitudinal strain, along with the change in the refractive index. The mechanical bending and associated spectral shift is repeated for many cycles without deterioration in their mechanical and optical properties.