Fig. 7.
(a) Schematic drawing of the NAM-IR method. The micelles collected on the nanomechanical string resonator are irradiated with monochromatic IR light from a QCL. The photothermal heating of the micelles causes the string to detune. An absorption spectrum is recorded by measuring the IR-wavelength-dependent frequency detuning of the nanomechanical resonator. (b) A NAM-IR spectrum with a resolution of 2 cm−1 of PEG-b-PAEMA-b-PCMA micelles, compared to the corresponding ATR-FTIR spectrum.