上海交通大学郭旭涵团队研究了小型化无序光子分子光谱仪。相关论文于2025年3月31日发表在《光：科学与应用》杂志上。

计算光谱仪这一新兴领域正在迅速发展，为高度小型化的片上系统提供了一条实现原位或便携式测量的途径。这些系统的性能通常在其编码器部分受到限制。由于周期性强度或过于平滑的响应，响应矩阵在很大程度上受到冗余的影响。因此，光谱编码器的物理尺寸、分辨率和带宽之间固有的相互依赖性对进一步的小型化进程构成了挑战。实现高光谱分辨率需要较长的光路长度，导致足够的光谱去相关需要更大的足迹，从而导致可检测的自由光谱范围（FSR）有限。

研究组报告了一种突破性的超小型无序光子分子光谱仪，它超过了当前光谱仪的分辨率带宽足迹指标。这种计算光谱仪利用复杂的电磁耦合来确定地生成准随机光谱响应矩阵，这是其他最先进系统中没有的特征，从根本上克服了当前技术中存在的局限性。

这种配置在保持高Q因子（>7.74× 10⁵）。通过动态操纵光子频率、振幅和相位，可以获得超过100 nm的宽工作带宽，具有8 pm的超高光谱分辨率，所有这些都封装在70×50μm²的超紧凑封装内。无序光子分子光谱仪构建在CMOS兼容的集成光子平台上，为高性能和高度可制造的小型化光谱提供了一种开创性的方法。

附：英文原文

Title: Miniaturized disordered photonic molecule spectrometer

Author: Zhang, Yujia, Albrow-Owen, Tom, Zhao, Zhenyu, Chen, Yinpeng, Zhao, Yaotian, Joyce, Hannah, Hasan, Tawfique, Yang, Zongyin, Su, Yikai, Guo, Xuhan

Issue&Volume: 2025-03-31

Abstract: The burgeoning field of computational spectrometers is rapidly advancing, providing a pathway to highly miniaturized, on-chip systems for in-situ or portable measurements. The performance of these systems is typically limited in its encoder section. The response matrix is largely compromised with redundancies, due to the periodic intensity or overly smooth responses. As such, the inherent interdependence among the physical size, resolution, and bandwidth of spectral encoders poses a challenge to further miniaturization progress. Achieving high spectral resolution necessitates a long optical path length, leading to a larger footprint required for sufficient spectral decorrelation, resulting in a limited detectable free-spectral range (FSR). Here, we report a groundbreaking ultra-miniaturized disordered photonic molecule spectrometer that surpasses the resolution-bandwidth-footprint metric of current spectrometers. This computational spectrometer utilizes complicated electromagnetic coupling to determinately generate quasi-random spectral response matrices, a feature absents in other state-of-the-art systems, fundamentally overcoming limitations present in the current technologies. This configuration yields an effectively infinite FSR while upholding a high Q-factor (>7.74×105). Through dynamic manipulation of photon frequency, amplitude, and phase, a broad operational bandwidth exceeding 100nm can be attained with an ultra-high spectral resolution of 8pm, all encapsulated within an ultra-compact footprint measuring 70×50μm2. The disordered photonic molecule spectrometer is constructed on a CMOS-compatible integrated photonics platform, presenting a pioneering approach for high-performance and highly manufacturable miniaturized spectroscopy.

DOI: 10.1038/s41377-024-01705-w

Source: https://www.nature.com/articles/s41377-024-01705-w