Fig. 4: Experiment characterization of WMHNA to decrease loading effect with broadband absorption enhancement.
From: Wavelength-multiplexed hook nanoantennas for machine learning enabled mid-infrared spectroscopy
a The testing reflection spectra of hook nanoantenna with PMMA thin film at different L. b The baseline-corrected reflection spectra from (a). c The normalized sensitivity of hook nanoantenna devices with different L indicates the loading effect. Sensitivity becomes maximum when the two wavelengths of molecular vibration and antenna resonance are matched. d the reflection spectra of WHHNA and hook nanoantenna devices (P1, P8, and P16) to form the supercell. e The sensing characterization of WMHNA by two types of thin films of PMMA and silk. f Baseline-corrected sensing signal of WMHNA compared with device P1, P8, and P16 by two analytes of PMMA and silk.
