Xia Chun, Kuebler Stephen M, Martinez Noel P, Martinez Manuel, Rumpf Raymond C, Touma Jimmy
Opt Lett. 2021 May 1;46(9):2228-2231. doi: 10.1364/OL.421860.
Wide-angle, broadband self-collimation (SC) is demonstrated in a hexagonal photonic crystal (PhC) fabricated in a low-refractive-index photopolymer by multiphoton lithography. The PhC can be described as a hexagonal array of cylindrical air holes in a block of dielectric material having a low-refractive index. Optical characterization shows that the device strongly self-collimates light at near-infrared wavelengths that span 1360 to 1610 nm. SC forces light to flow along the extrusion direction of the lattice without diffractive spreading, even when light couples into the device at high oblique angles. Numerical simulations corroborate the experimental findings.
通过多光子光刻技术在低折射率光聚合物中制备的六角形光子晶体（PhC）中实现了广角、宽带自准直（SC）。该光子晶体可描述为低折射率介电材料块中圆柱形气孔的六角形阵列。光学表征表明，该器件在1360至1610nm的近红外波长范围内能强烈地自准直光。即使光以高倾斜角耦合到器件中，自准直也能使光沿晶格的挤压方向传播而无衍射扩展。数值模拟证实了实验结果。
