Miniaturized optical spectrometers could be of use in portable and wearable applications. Such devices have typically been based on arrays of photodetectors that provide distinct spectral responses or use complex miniaturized dispersive optics. However, these approaches often result in large centimetre-sized systems. Here we report a microsized optical spectrometer that is based on an optical-spacer-integrated photomultiplication-type organic photodetector with a bias-tunable spectral response. The approach allows the computational reconstruction of an incident light spectrum from photocurrents measured under a set of different bias voltages. The device, which has a footprint of 0.0004 cm², is capable of broadband operation across the entire visible wavelength with a sub-5-nm resolution. To illustrate the capabilities of this approach, we fabricate an 8 × 8 spectroscopic sensor array that can be used for hyperspectral imaging.

小型化光学光谱仪可用于便携式和可穿戴应用。此类设备通常基于提供不同光谱响应或使用复杂的小型化色散光学器件的光电探测器阵列。然而，这些方法通常会导致大型厘米级系统。在这里，我们报告了一种微型光学光谱仪，它基于具有偏置可调光谱响应的光学间隔集成光电倍增型有机光电探测器。该方法允许根据在一组不同偏置电压下测量的光电流来计算重建入射光谱。该器件的占地面积为 0.0004 cm ² ，能够在整个可见光波长范围内以低于 5 nm 的分辨率进行宽带操作。为了说明这种方法的功能，我们制造了一个可用于高光谱成像的 8 × 8 光谱传感器阵列。