Mid- to far-infrared sensing: SrTiO₃, a novel optical material

Abstract

SrTiO3 as a disruptive technological solution to the inflated expectations of plasmonics, targeting the mid and far infrared wavelengths.

Plasmonic antenna coupling to hyperbolic phonon-polaritons for sensitive and fast mid-infrared photodetection with graphene

“…[39][40][41] ). Additional tuning and wavelength sensitivity can be realized by controlling the hyperbolic material's thickness 24,42 or shape 1,[43][44][45] .…”

Worthwhile Relevance of Infrared Spectroscopy in Characterization of Samples and Concept of Infrared Spectroscopy-Based Synchrotron Radiation

“…e infrared region of the electromagnetic spectrum is in three portions, namely, the near-, mid-, and far-IR [3,19]. ey are named based on their relationships with the visible spectrum [20]. e near-IR has a high energy of approximately 14000-4000 cm −1 , which can excite harmonic vibrations [3].…”

Revisiting longitudinal optical modes in materials with plasmon and plasmon-like absorptions – SrTiO3 and β-Ga2O3

“…Recently, also SrTiO3 has gained attraction, since its reststrahlenband is exceptionally broad and promises wide tunability of the SPhPs correspondingly. 15 A reststrahlenband is generally characterized by high reflectance close to unity between its transversal optical (TO) mode frequency and its longitudinal optical (LO) mode position, between which the real part of the dielectric function is usually negative. This situation is comparable to that of a metal below its plasma frequency.…”

“…[16][17][18] For SrTiO3, the situation is somewhat more complex, since it features 3 different absorptions which have their TO mode positions within the reststrahlenband. 15,[19][20][21] The TO-LO pairs have been assigned simply consecutively, i.e. with increasing wavenumber, the first TO mode is assumed to be followed by its LO mode and so forth.…”