Chen Yan-Han, Wang Chun-Ta, Yu Chin-Ping, Lin Tsung-Hsien
Department of Photonics, National Sun Yat Sen University, Kaohsiung, Taiwan.
Opt Express. 2011 Dec 5;19(25):25441-6. doi: 10.1364/OE.19.025441.
This work demonstrates a polarization-independent electrically tunable Fabry-Pérot (FP) filter that is based on polymer-stabilized blue phase liquid crystals (PSBPLCs). An external vertical electric field can be applied to modulate the effective refractive index of the PSBPLCs along the optical axis. Therefore, the wavelength-tuning property of the FP filter is completely independent of the polarization state of the incident light. The change in the birefringence in PSBPLCs is governed by Kerr effect-induced isotropic-to-anisotropic transition, and so the PSBPLCs based FP filter has a short response time. The measured tunability and free spectral range of the FP filter are 0.092 nm/ V and 16nm in the visible region, and 0.12nm/ V and 97nm in the NIR region, respectively, and the response time is in sub-millisecond range. The fast-responding polarization-independent electrically tunable FP filter has substantial potential for practical applications.
这项工作展示了一种基于聚合物稳定蓝相液晶（PSBPLC）的偏振无关电可调法布里-珀罗（FP）滤波器。可以施加外部垂直电场来调制PSBPLC沿光轴的有效折射率。因此，FP滤波器的波长调谐特性完全独立于入射光的偏振态。PSBPLC中双折射的变化由克尔效应诱导的各向同性到各向异性转变控制，因此基于PSBPLC的FP滤波器具有短响应时间。在可见光区域，所测量的FP滤波器的可调谐性和自由光谱范围分别为0.092nm/V和16nm，在近红外区域分别为0.12nm/V和97nm，并且响应时间在亚毫秒范围内。这种快速响应的偏振无关电可调FP滤波器在实际应用中具有巨大潜力。
