Tunable Berreman mode in highly conductive organic thin films

Yu, Xinlan; Qiu, Jiahuan; Hu, Qili; Chen, Kuan-An; Zheng, Jun; Du, Miao; Ye, Hui

doi:10.1364/oe.472115

Cited by 3 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…X-ray diffraction (XRD) (Supporting Information Figure S2) confirms that dry annealing of the as-deposited film causes PEDOT chains to undergo a change from an amorphous to a polycrystalline state. The increased hole concentration and the improved film crystallinity are considered to manifest a considerable increase in carrier mobility μ. ,, Figure b shows that such a treatment for the PEDOT:PSS film causes the blue shift of the plasma frequency ω P and the ENZ frequency ω ENZ from the mid-infrared to 189 THz (λ ENZ = 1587 nm), which were extrapolated from the reflection spectrum inversion on the basis of the Drude model …”

Section: Resultsmentioning

confidence: 99%

“…Drying of PEDOT:PSS films were performed at 160 °C for 15 min. A more detailed preparation process and the influence of different degrees of EG treatment on the linear optical and electrical properties are given in our other published works. , …”

Section: Methodsmentioning

confidence: 99%

“…A more detailed preparation process and the influence of different degrees of EG treatment on the linear optical and electrical properties are given in our other published works. 33,34 The acid-modified PEDOT:PSS thin-film samples researched here were obtained by the spin-coating method and then treated by acidification. PEDOT:PSS films were prepared by spin coating the PEDOT:PSS aqueous solution on 1.3 cm × 1.3 cm glass substrates.…”

Section: ■ Conclusionmentioning

confidence: 99%

“…The increased hole concentration and the improved film crystallinity are considered to manifest a considerable increase in carrier mobility μ. 23,33,34 Figure 1b shows that such a treatment for the PEDOT:PSS film causes the blue shift of the plasma frequency ω P and the ENZ frequency ω ENZ from the midinfrared to 189 THz (λ ENZ = 1587 nm), which were extrapolated from the reflection spectrum inversion on the basis of the Drude model. 32 The carrier concentration of the pristine PEDOT film can be further improved to 3.1 × 10 21 cm −3 by acid treatment (see Methods), which shows an ENZ wavelength of 865 nm located at the near-visible region, as shown in the Figure 1b.…”

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tunable Organic ENZ Materials with Large Optical Nonlinearity

Hu,

Yu,

Liu

et al. 2023

ACS Photonics

Self Cite

View full text Add to dashboard Cite

Epsilon-near-zero (ENZ) materials have shown significant potential for nonlinear optical applications due to their extraordinary enhancement of optical nonlinearity. Our experiments show that poly(3,4-ethylenedioxythiophene) (PEDOT) films can be modified to boost their conductivity and exhibit ENZ wavelengths from mid-infrared to visible regimes. Degenerate optical nonlinearity coefficients of EG-modified PEDOT films with an ENZ wavelength of 1587 nm are enhanced at 1550 nm to be larger than those of most of the inorganic ENZ materials. The small linear index and the large nonlinear index cause a 210% change in transmittance between low and high power intensities. We attribute the ENZ enhancement to the increased absorptance of bipolarons in PEDOT films. The pump−probe technique reveals the transient process of the bipolaron transition. The highly tunable carrier concentration and mobility enable PEDOT to be an extraordinary nonlinear optical material, which leads to new possibilities of PEDOT:PSS in plasmonics, nonlinear optics, and on-chip nanophotonic devices.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: ■ Conclusionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tunable Organic ENZ Materials with Large Optical Nonlinearity

Hu,

Yu,

Liu

et al. 2023

ACS Photonics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thin film materials are essential in a wide field of applications such as sensing, [1][2][3][4] separation, [2,5,6] optoelectronics, [1,4,7] energy, [1,5,8,9] transistors [3,10,11] polymer science, [1,12,13] material research, corrosion science, [1] environmental science [6] catalysis, [2,14,15] and biomedicine. [16][17][18] The specific infrared (IR) spectroscopic method to study these films must be chosen depending on the properties to be determined as well as the kind of sample, the specific material, and the environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Field Manipulation of Band Properties in Infrared Spectra of Thin Films

Hinrichs,

Shetty,

Kubatkin

et al. 2023

Advanced Photonics Research

View full text Add to dashboard Cite

This comprehensive optical study analyzes field manipulations of bands in infrared (IR) spectra of thin films and functional surfaces for varying measurement and sample conditions. Band variations related to the materials dielectric functions, the measurement geometry, the film thickness as well as the direction dependence of the probing electromagnetic fields are demonstrated. Examples are discussed for isotropic polymer films (≈200 nm polymethylmethacrylate [PMMA]) on gold and silicon as well as an anisotropic hydrogen monolayer on a Si(111) surface, characterized by IR–attenuated total reflection, IR microscopy, and incidence‐angle‐dependent IR polarimetry. Even for fixed optical material properties, significant manipulations of band frequency and shape (shifts up to ≈14 cm−1 for PMMA, up to ≈3 cm−1 for H–Si) occur in not only polarization‐dependent but also unpolarized spectra. The shown data underline that polarimetric measurements and optical analyses are essential for a detailed interpretation of band shapes.

show abstract

Tunable ENZ properties in organic material PEDOT:PSS treated with different solutions

Han,

Qiu,

Liu

et al. 2024

Opt. Mater. Express

View full text Add to dashboard Cite

Epsilon-near-zero (ENZ) materials have drawn significant attention due to their novel properties near ENZ wavelengths. One such material, PEDOT:PSS, is a conducting polymer whose performances can be easily modified using convenient solution treatment methods. In this paper, pristine, ethylene glycol (EG) -treated, and concentrated sulfuric acid -treated PEDOT:PSS films were found to achieve ENZ wavelengths at 1657 nm, 1450 nm, and 1162 nm, respectively. Spectrum numerical fitting, Hall measurement, structural characterizations and differential analysis were performed to investigate the effects of the solution modification method on the ENZ performances of PEDOT:PSS films. Furthermore, the imaginary part of permittivity was decomposed through the Drude-Lorentz dispersion model to explain dynamics of polarons and bipolarons in PEDOT:PSS, the bipolarons in acid-treated film was found to play an important role on ENZ properties. The quality factors QSPP and QLSPR were used to evaluate the performance of different ENZ materials for device applications. Our findings pave the way for further research on ENZ photonics of organic materials.

show abstract

Tunable Berreman mode in highly conductive organic thin films

Cited by 3 publications

References 40 publications

Tunable Organic ENZ Materials with Large Optical Nonlinearity

Tunable Organic ENZ Materials with Large Optical Nonlinearity

Field Manipulation of Band Properties in Infrared Spectra of Thin Films

Tunable ENZ properties in organic material PEDOT:PSS treated with different solutions

Contact Info

Product

Resources

About