“…The Ag-doped ITO’s complex refractive index components n and k were extracted by model fitting experimental data obtained from spectroscopic ellipsometry (see Figure 2 b). The refractive indexes of PET and PDMS are taken from reference and were plotted in Figure A4 [ 34 , 35 ]. As one can see, the overall trend of fitting results is consistent with the same results experimentally measured.…”
Section: Resultsmentioning
confidence: 99%
“… Figure A4 Optical constant of different materials. ( a ) PET and ( b ) PDMS in IR range [ 34 , 35 ]. Figure A5 ( a ) Reflection spectrum of different points of the PAIP sample.…”
Transparent heat mirrors have been attracting a great deal of interest in the last few decades due to their broad applications, which range from solar thermal convection to energy-saving. Here, we present a flexible Polyethylene terephthalate/Ag-doped Indium tin oxide/Polydimethylsiloxane (PAIP) thin film that exhibits high transmittance in visible range and low emissivity in the thermal infrared region. Experimental results show that the temperature of the sample can be as high as 108 °C, which is ~23 °C higher than that of a blackbody control sample under the same solar radiation. Without solar radiation, the temperature of the PAIP thin film is ~6 °C higher than that of ordinary fabric. The versatility of the large-area, low-radiation-loss, highly-transparent and flexible hydrophobic PAIP thin film suggest great potential for practical applications in thermal energy harvesting and manipulation.
“…The Ag-doped ITO’s complex refractive index components n and k were extracted by model fitting experimental data obtained from spectroscopic ellipsometry (see Figure 2 b). The refractive indexes of PET and PDMS are taken from reference and were plotted in Figure A4 [ 34 , 35 ]. As one can see, the overall trend of fitting results is consistent with the same results experimentally measured.…”
Section: Resultsmentioning
confidence: 99%
“… Figure A4 Optical constant of different materials. ( a ) PET and ( b ) PDMS in IR range [ 34 , 35 ]. Figure A5 ( a ) Reflection spectrum of different points of the PAIP sample.…”
Transparent heat mirrors have been attracting a great deal of interest in the last few decades due to their broad applications, which range from solar thermal convection to energy-saving. Here, we present a flexible Polyethylene terephthalate/Ag-doped Indium tin oxide/Polydimethylsiloxane (PAIP) thin film that exhibits high transmittance in visible range and low emissivity in the thermal infrared region. Experimental results show that the temperature of the sample can be as high as 108 °C, which is ~23 °C higher than that of a blackbody control sample under the same solar radiation. Without solar radiation, the temperature of the PAIP thin film is ~6 °C higher than that of ordinary fabric. The versatility of the large-area, low-radiation-loss, highly-transparent and flexible hydrophobic PAIP thin film suggest great potential for practical applications in thermal energy harvesting and manipulation.
“…In this simulation, the absorption cross section of PMMA particle at 1729 cm −1 is evaluated by using the Mie scattering theory. The used complex refractive index of PMMA is 1.4176 + i 0.361, where the imaginary part represents the extinction coefficient ( 76 ). Absorption coefficient is derived from Mie theory based on a Python package ( 77 ).…”
Mid-infrared (IR) spectroscopic imaging using inherent vibrational contrast has been broadly used as a powerful analytical tool for sample identification and characterization. However, the low spatial resolution and large water absorption associated with the long IR wavelengths hinder its applications to study subcellular features in living systems. Recently developed mid-infrared photothermal (MIP) microscopy overcomes these limitations by probing the IR absorption–induced photothermal effect using a visible light. MIP microscopy yields submicrometer spatial resolution with high spectral fidelity and reduced water background. In this review, we categorize different photothermal contrast mechanisms and discuss instrumentations for scanning and widefield MIP microscope configurations. We highlight a broad range of applications from life science to materials. We further provide future perspective and potential venues in MIP microscopy field.
“…For instance, it is useful to identify tumours [1,2] or to characterize deteriorated binders and materials in ancient wall paintings [3]. It is also employed in the quantification of harmful species in Earth's atmosphere [4], in designing new optical devices and sensors with optimized performances [5,6] and in the fabrication of radiative cooling systems [6]. For such applications, as well as to provide accurate data for numerical simulations, it is necessary to precisely know the complex refractive indices of the used materials.…”
Section: Introductionmentioning
confidence: 99%
“…For such applications, as well as to provide accurate data for numerical simulations, it is necessary to precisely know the complex refractive indices of the used materials. However, precise values are still very scarcely known and experimental set-ups to measure them are not always available, leading to assumptions and conclusions, which may be inappropriate [6].…”
A new theoretical methodology enabling the determination of the complex refractive index has been developed and explored; it only requires to use a classical setup to control the incident angle, without the need for a polarizer. As a proof of concept, this new methodology has been successfully applied to investigate the optical properties of amorphous silica in the mid-infrared spectral range and validated by comparison with a standard routine based on polarization state of the light. This work thus makes it possible to determine the complex refractive index of an isotropic material by a reflectance measurement without needing to control the polarization of light. The refractive index can be measured with a relative uncertainty close to 10 −3 over a wide range of wavelengths, as needed for a growing number of optical applications. Therefore, this new technique is cost effective and permits the accurate assessment of the refractive index in the whole infrared range.
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