Figure 15.1 — Raman spectra of optically trapped red blood cells Figure 15.1 — Raman spectra of optically trapped red blood cells. Comparison between the spectra of optically trapped normal and β-thalassemic RBCs. The arrows indicate the spectral features affected by intensity changes, whereas the dashed lines highlight the observed energy shifts.Reprinted from De Luca et al., Opt. Express 16, 7943–57. Copyright (2008) The Optical Society.