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 4 publications

(6 citation statements)

References 40 publications

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“…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%

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Tunable Organic ENZ Materials with Large Optical Nonlinearity

Hu,

Yu,

Liu

et al. 2023

ACS Photonics

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: ■ Conclusionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Tunable Organic ENZ Materials with Large Optical Nonlinearity

Hu,

Yu,

Liu

et al. 2023

ACS Photonics

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“…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

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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.

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Refractive index sensing characteristics of PCF-SPR based on dual-plasmon materials

Ying,

Shang,

Gao

et al. 2024

J. Opt.

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In this paper, a photonic crystal fiber (PCF) refractive index sensor based on surface plasmon resonance (SPR) with dual plasmonic materials (indium tin oxide and gold) is proposed. We innovatively designed a dual-core PCF structure and pore arrangement effectively enhancing the coupling effect. Using two different plasma materials, phase matching is achieved at two different wavelengths for the evanescent and surface plasmon waves, resulting in dual resonance peaks. The refractive index sensing is accomplished by measuring the dual-peak resonance shift, which expands the detection wavelength and RI detection ranges. The sensor can detect analytes with refractive indices ranging from 1.32 to 1.43 at wavelengths between 0.4 um and 1.4 um. We optimized the photonic crystal fiber structure and studied the sensing performance of the sensor, improving its sensitivity. Simulation results indicate that the designed PCF sensor exhibits outstanding maximum dual-peak shift sensitivity (DPSS), reaching up to 28,000 RIU-1, along with maximum amplitude sensitivity (AS) and wavelength sensitivity (WS) of 18,500 RIU-1 and 34,500 RIU-1, respectively, in the direction of y-polarization. Furthermore, the sensor achieves high resolution, and the figure of merit (FOM) values can reach up to 5.134×10-7 and 2758. Consequently, the proposed sensor can provide high-precision and extensive-range measurements of solution refractive indices within the visible and infrared light spectrum, and it holds potential application prospects in numerous fields, such as food safety testing and chemical substance detection.

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Tunable Berreman mode in highly conductive organic thin films

Cited by 4 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

Refractive index sensing characteristics of PCF-SPR based on dual-plasmon materials

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