“…Many such emerging areas require tighter performance, e.g., often demanding spectral widths of 100 nm or less [4,5], and significantly smaller (down to ≈10 nm) for multispectral and hyperspectral detection/ imaging. Over the years, these functional demands have been extended to the near infrared range (NIR, λ≈740-2000 nm), which is relevant, e.g., to night vision, navigation aids, astronomy and chemical fingerprinting (for medicine, agriculture, earth sciences, etc) [6][7][8][9]. Examples of such applications are shown in figure 1.…”