Abstract
We experimentally demonstrate surface plasmon resonance (SPR) in the terahertz range in InSb and InAs. The surface plasmon is excited on the interface between a thin polymer film and the semiconductor using a silicon prism in Otto configuration. The low effective mass of InSb and InAs permits tuning of the SPR by an external magnetic field in the transversal configuration. The data show a good agreement with a model. Strong excitation of the surface plasmon is present in both materials, with a shifting of resonance position by more than 100 GHz for the field of 0.25 T, to both higher and lower energies with opposite orientation of the magnetic field. Applicability of the terahertz SPR sensor is discussed, along with modeled design for the Kretschmann configuration.
Highlights
The surface plasmon resonance (SPR)[1], i.e. coupling of an electromagnetic wave to a collective oscillation of free carriers on the interface between a conductor and dielectric as a surface wave allows highly accurate sensing
Note that the same effect as with varying the angle of incidence can be obtained by change of the refractive index of prism, because the tangential component of the prism propagation constant is νy = nprism ⋅ sin φ, nSi,prism = 3.4164
We have demonstrated experimental feasibility of exciting surface plasmon resonance at the interface of InSb(InAs)/dielectric in the Terahertz range using a high refractive index prism, previously described only theoretically
Summary
The surface plasmon resonance (SPR)[1], i.e. coupling of an electromagnetic wave to a collective oscillation of free carriers on the interface between a conductor and dielectric as a surface wave allows highly accurate sensing. This sensitivity to the properties and changes in the dielectric (analyte) has found its use primarily in biomedical applications[2]. The advent of modern usable terahertz technology meant that surface (magneto) plasmons on semiconductors in the THz have been investigated for their properties[17,18] and applications, ranging from the THz radiation detection[19] to www.nature.com/scientificreports/. Further advances in the design of prism-coupled SPR THz sensor remained in the theoretical domain[7,8,10,21]
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