Conformal spray-deposited fluorine-doped tin oxide for mid- and long-wave infrared plasmonics

Gibson, Ricky; Vangala, Shivashankar; Oladeji, Isaiah O.; Smith, Evan M.; Khalizadeh-Rezaie, Farnood; Leedy, Kevin D.; Claflin, B.; Cooper, Tim; Peale, Robert E.; Cleary, Justin W.

doi:10.1364/ome.7.002477

Cited by 7 publications

(1 citation statement)

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“…Firstly, the radii of O 2− and F − are similar, which could prevent lattice mismatch in doping; next, the introduction of fluorine would inhabit formation of oxygen vacancies; then, it's easy to prepare F doped TCOs by CVD, spray‐pyrolysis, and other low‐cost technology. Due to the fact that electrons are readily trapped in fluorine sites, fluorine doped TCOs show limitations in electron mobility (15.3 cm 2 V −1 s −1 comparing to 36.4 cm 2 V −1 s −1 for ITO) . Surface plasmon properties of fluorine doped tin oxides and their applications in mid‐infrared are reported recently, With the aids of grating coupling, SPP modes are successfully excited by a 7.5 µm and a 10 µm periodic grating, respectively, showing two absorption bands located at 8 and 10.3 µm in FTIR spectrum, respectively.…”

Section: Methodsmentioning

confidence: 99%

Transparent Conductive Oxides and Their Applications in Near Infrared Plasmonics

Wang

Chen

et al. 2019

Physica Status Solidi (a)

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Transparent conductive oxides (TCOs) have been widely used as an important component of optoelectronic devices. They are required to exhibit high performance in both visible-range transparency and electronic conductivity simultaneously. In near infrared (NIR) wavelength, these highly doped semiconductor oxide materials exhibit a drop in their real part of dielectric permittivity from positive to negative. In other words, the epsilon-near-zero (ENZ) frequency of TCO is located in NIR spectral regime. On the other hand, the imaginary part of the permittivity is relatively low which implies less optical loss when compared to noble metals. This "metal-like" permittivity dispersion characteristic of TCOs means their capability to support surface plasmons (SPs) in the NIR regime. In this paper, a summary of various physical parameters of commonly used TCOs such as ITO, AZO, and FTO, etc., is given. These parameters include carrier density, carrier mobility, plasma frequency, and ENZ wavelength. The difference among these parameters determines their diverse performance in infrared range. In this paper, the important role of TCOs for applications in the NIR/IR wavelength ranges are reinforced, as they are demonstrated in the visible range.

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Section: Methodsmentioning

confidence: 99%