Split ring resonator (SRR) based metamaterials have frequently been demonstrated for use as optical sensors of organic materials. This is made possible by matching the wavelength of the SRR plasmonic resonance with a molecular resonance of a specific analyte, which is usually placed on top of the metal structure. However, systematic studies of SRRs that identify the regions that exhibit a high electric field strength are commonly performed using simulations. In this paper we demonstrate that areas of high electric field strength, termed “hot-spots,” can be found by localizing a small quantity of organic analyte at various positions on or near the structure. Furthermore, the sensitivity of the SRR to the localized analyte can be quantified to determine, experimentally, suitable regions for optical sensing.
- split ring resonators
- optical sensors
- localized analyte
Sharpe, G. J., Vilhena, H., Lahiri, B., McMeekin, S., De La Rue, R. M., & Johnson, N. P. (2016). Mapping the sensitivity of split ring resonators using a localized analyte. Applied Physics Letters, 108(25), . https://doi.org/10.1063/1.4954797