Fig. 5: Demonstration of the proposed ECOS spectrometer with reduced numbers of filter units n.
From: Miniaturized on-chip spectrometer enabled by electrochromic modulation
a Scheme of the ECOS by only using four filter units (n = 4). b–d The reconstructed spectra of three representative monochromatic light (peaks of 450 nm, 550 nm, and 652 nm) by using only four filter units (0°, 30°, 60°, 135°). e The reconstructed spectra of the green LED light by using four filter units (0°, 30°, 60°, 135°). f The MSE values of reconstructed spectra in (b)–(e). g The MSE values of reconstructed spectra of green LED light under three modes of voltage utilization by only using two filter units. h–j The reconstructed spectra of green LED light by using only two filter units (60°, 135°). Here m denotes different detection modes: ‘m = 1 (blue)’ refers to the usage of only ‘0 V’, ‘m = 2 (green)’ refers to the usage of ‘0 V’ and ‘−1.2 V’, and ‘m = 3 (red)’ refers to the usage of ‘0 V’, ‘−1.2 V’ and ‘−1.5 V’
