Chirality is a geometrical property described by continuous mathematical functions^1,2,3,4,5. However, in chemical disciplines, chirality is often treated as a binary left or right characteristic of molecules rather than a continuity of chiral shapes. Although they are theoretically possible, a family of stable chemical structures with similar shapes and progressively tuneable chirality is yet unknown. Here we show that nanostructured microparticles with an anisotropic bowtie shape display chirality continuum and can be made with widely tuneable twist angle, pitch, width, thickness and length. The self-limited assembly of the bowties enables high synthetic reproducibility, size monodispersity and computational predictability of their geometries for different assembly conditions⁶. The bowtie nanoassemblies show several strong circular dichroism peaks originating from absorptive and scattering phenomena. Unlike classical chiral molecules, these particles show a continuum of chirality measures² that correlate exponentially with the spectral positions of the circular dichroism peaks. Bowtie particles with variable polarization rotation were used to print photonically active metasurfaces with spectrally tuneable positive or negative polarization signatures for light detection and ranging (LIDAR) devices.

^{手性是由连续数学函数1,2,3,4,5}描述的几何性质。然而，在化学学科中，手性通常被视为分子的二元左或右特征，而不是手性形状的连续性。尽管它们在理论上是可能的，但具有相似形状和逐渐可调手性的稳定化学结构家族尚不清楚。在这里，我们展示了具有各向异性领结形状的纳米结构微粒显示出手性连续体，并且可以制成具有广泛可调的扭转角、节距、宽度、厚度和长度。领结的自限制组装使得不同组装条件下的几何形状具有高合成再现性、尺寸单分散性和计算可预测性⁶。蝴蝶结纳米组件显示出几个源自吸收和散射现象的强圆二色性峰。^{与经典的手性分子不同，这些粒子显示出手性测量2}的连续体，其与圆二色性峰的光谱位置呈指数关系。具有可变偏振旋转的领结粒子用于打印具有光谱可调正或负偏振特征的光子活性超表面，用于光检测和测距（LIDAR）设备。