Fig. 3

Characterization of microtaper spectrometers. a Reconstruction of continuous spectra with FWHM 30, 60, 90 nm. The black dashed line is ground truth. b Reconstruction of two narrow peaks with separation 1.53 pm, 6.89 pm, 18.95 pm. c Evaluation of resolution of three spectrometers made from tapers with different core diameters. The core diameter from left to right is 8.2 m\(\upmu\), 62.5 m\(\upmu\), 105 m\(\upmu\). d Evaluation of resolution of three spectrometers made from tapers with different heater regions. The heater region length from left to right is 1.5 mm, 3.0 mm, 5.0 mm. Each column of data in the heatmap represents the estimated result of a set of measurement data (see method). The black dashed lines represent estimated resolution of each measurement data. The scale bar in c, d is shared by respective subfigures