Journal
ACS PHOTONICS
Volume 2, Issue 11, Pages 1567-1575Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00321
Keywords
plasmonics; metamaterials; sensing; surface enhanced infrared spectroscopy; extraordinary optical transmission; perfect absorption
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Funding
- research project Jenaer Biochip Initiative 2.0 within the framework Unternehmen Region - InnoProfile Transfer - Federal Ministry of Education and Research, Germany (BMBF) [03IPT513Y]
- research project PhoNa - Photonic Nanomaterials - German Federal Ministry of Education [03IS2101A]
- Thuringian Ministry for Education, Science, and Culture
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Extraordinary optical transmission and perfect absorption are two plasmonic-based optical phenomenona that are both accompanied by high local field enhancements that can be exploited for biological and chemical sensing. Here we merge both phenomenona in a slit array metamaterial perfect absorber consisting of a dielectric layer sandwiched between two metallic layers of which the upper layer is perforated with a periodic array of slits. Period and dimensions of the slits and thickness of the dielectric layer are tuned in a way that virtually all light of a certain wavelength incident on the surface passes through the slits and is subsequently absorbed. As a consequence, light matter interaction is greatly enhanced in the slits. Thus, already small concentrations of analytes down to a monolayer attached to the sidewalls of the slits can be detected by refractive index sensing and identified by their spectral fingerprints with a standard mid-infrared lab spectrometer.
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