Abstract
In this paper, experimental evidences about the resonance phenomena in a negative 2D photonic crystal are shown. Localized plasmon-like modes and guided mode resonances are detected in the reflectivity spectrum of a photonic crystal slab irradiated with out-of-plane incident radiation. The strong confinement of the radiation, in addition to the field enhancement, make photonic crystals a very appealing alternative to plasmonic substrates, avoiding the limits of absorption losses in metals.
Highlights
Controlling and manipulating the light at nanoscale can play a key role in several physical phenomena in both fundamental and applied research
Among the applications of surface plasmon resonance (SPR) in optical biosensing, a noticeable example is represented by surface enhanced Raman spectroscopy (SERS) [8]–[11], where local plasmon states are excited in proximity of metallic nano-particles by incident laser light with a consequent enhancement of the Raman signal from the analyzed molecules
We present experimental measurements of these two separate resonant phenomena in a 2D photonic crystals (PhCs) sample characterized by a negative effective permittivity, exploited by using two different optical configurations
Summary
Castellino 111, 80131 Napoli, Italy CNR-IBP, Via P. Castellino 111, 80131 Napoli, Italy Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, USA CNR-IMM-Unitadi Napoli, Via P. Castellino 111, 80131 Napoli, Italy CNR-IMM-Unitadi Napoli, Via P. Experimental evidences about the resonance phenomena in a negative 2D photonic crystal are shown. Localized plasmon-like modes and guided mode resonances are detected in the reflectivity spectrum of a photonic crystal slab irradiated with out-of-plane incident radiation. The strong confinement of the radiation, in addition to the field enhancement, make photonic crystals a very appealing alternative to plasmonic substrates, avoiding the limits of absorption losses in metals.
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