Journal
APPLIED SCIENCES-BASEL
Volume 12, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/app12073633
Keywords
coherent perfect absorption; total internal reflection; Fabry-Perot resonator; transparent dielectric layer; critical coupling; complex refractive index; MgF2; polyvinylpyrrolidone; waveguide-mode sensor; grazing incidence
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This paper proposes and realizes a simple and inexpensive scheme for single-channel coherent perfect absorption (CPA) of transparent materials. By dip-coating a PVP film on a substrate, white light can be absorbed and extracted through multiple reflections. The materials and substrates used in this scheme can be changed and it has various potential applications.
Featured Application Interfacial sensors or light modulators made of transparent dielectric materials alone. A simple scheme for single-channel coherent perfect absorption (CPA) of transparent materials is proposed and experimentally realized using total internal reflection by grazing incidence, with a single dielectric layer sandwiched by semi-infinite dielectric layers. In a 1.48-mu m thick polyvinylpyrrolidone (PVP) film, dip-coated on a MgF2 substrate both transparent in the visible, reflectance dips due to nearly 90% absorption by single-channel CPA were observed in the wavelength range of 370-800 nm, with white light from a Xe lamp incident on the side face of the substrate and extracted from the other side through multiple reflections in the PVP layer. This is a simple and inexpensive CPA scheme, and it is expected to have various applications by changing the substrate/polymer material or dispersing molecules in the polymer film. This paper also provides a design guideline for grazing-incidence waveguide-mode sensors using transparent dielectric materials.
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