Interaction of terahertz electromagnetic radiation with a probe-object system in a terahertz apertureless near-field microscope

Trukhin, V. N.; Andrianov, A. V.; Быков, В. А.; Golubok, A. O.; Zinov’ev, N. N.; Samoilov, L. L.; Sapozhnikov, I. D.; Trukhin, A. V.; Felshtyn, M. L.

doi:10.1134/s0021364011030179

Cited by 14 publications

(4 citation statements)

References 5 publications

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“…As see from the absorption coefficients in Figure 7b, the absorption coefficients of the three samples after irradiation (30 kGy) are changed to different degrees. 40,41 The MMA with the strongest original absorption decreased obviously after irradiation, and the absorption at 1.0 THz decreased from 40 to 10 cm À1 from the original, while the LMA with the smaller original absorption, showed a slight rise after irradiation. The HMA also showed an obvious decrease in absorption after irradiation.…”

Section: Terahertz Analysismentioning

confidence: 98%

Terahertz spectroscopy research on motion‐limited molecular chain of random polymethacrylate

Huang,

Yang,

2023

J of Applied Polymer Sci

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In this study, an innovative method was used to examine the impact of gamma‐ray irradiation on three specific monomers: methyl methacrylate (MMA), hexyl methacrylate (HMA), and lauryl methacrylate (LMA). The primary objective was to produce corresponding polymers—polymethyl methacrylate (PMMA), polyhexyl methacrylate (PHMA), and poly(lauryl methacrylate) (PLMA). The significance of the research was determined by conducting a thorough analysis of the thermal properties and structural characteristics of these polymers using advanced techniques, including thermogravimetric analysis and differential scanning calorimetry (TGA‐DSC), as well as Fourier transform infrared spectroscopy (FTIR). The results indicated that irradiation at a 30 kGy dose caused distinct decomposition of ester groups within the polymer matrices. Additionally, a clear trend was observed in the maximum exothermic temperature among the three polymers, with PMMA exhibiting the lowest temperature, followed by PLMA, and PHMA with the highest temperature. Surprisingly, when the radiation dose exceeded 30 kGy, PHMA's thermal stability peaked, demonstrating remarkable resistance to further changes. This highlights the crucial role of radiation dosage in adjusting polymer thermal properties. Furthermore, analysis of infrared characteristic peaks identified a critical radiation dose range between 15 and 30 kGy, where polymerization was efficiently promoted without generating extra by‐products, showcasing experimental ingenuity. Lastly, optical properties of the synthesized polymers were explored using THz time‐domain spectroscopy. Results showed intriguing changes in refractive indices following 30 kGy dose irradiation. Specifically, MMA and HMA exhibited moderate refractive index increases, while LMA displayed a significant decrease. Notably, PHMA demonstrated substantial absorption reduction beyond 15 kGy doses, with minimal further changes, highlighting the potential to customize polymer optical properties through controlled irradiation.

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Section: Terahertz Analysismentioning

confidence: 98%

Terahertz spectroscopy research on motion‐limited molecular chain of random polymethacrylate

Huang,

Yang,

2023

J of Applied Polymer Sci

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“…The amount of probe scattered radiation in the near field depends on the dielectric properties of a sample, which are in turn determined by its conduc tivity, the presence of impurities, etc. Thus, the near field microscope can be used to study materials and impurities (e.g., in semiconductors [20,21] and poly mer films [22]), as well as the distribution of free charges with concentrations of 10 16 -10 19 cm -3 [8,10] at which the plasma oscillation frequency lies in the terahertz frequency range. Studying polymer nano particles, viruses, and protein molecules is a potential application field of the described microscope [23].…”

Section: Attenuated Total Internal Reflection Modulementioning

confidence: 99%

“…However, most studies in this frequency region were performed using low power broadband terahertz radiation sources (see, e.g., [9]). The only Russian study in this field that is known to us is paper [10]. It is obvious that a scanning optical near field microscope with a laser source has a number of advantages, but the development of this trend is limited by narrow oscillation frequency ranges of ordinary lasers.…”

Section: Introductionmentioning

confidence: 99%

“…A scheme in which an object and a conducting probe, which is positioned nearby, are illuminated with focused radiation at an angle to the sample surface is commonly used for samples whose surfaces reflect ter ahertz radiation rather well [10]. In this scheme, a near field is formed by the probe-object system, and the probe scattered radiation is detected against a back ground of the main reflected radiation.…”

Section: Introductionmentioning

confidence: 99%

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A terahertz scanning near-field optical microscope with an attenuated total internal reflection module

et al. 2014

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The first terahertz scanning near field optical microscope with an attenuated total internal reflec tion module and a free electron laser (FEL) as the radiation source was developed. A scanning system with positioning using a confocal sensor with chromatic coding and a surface-subwavelength probe touch sensor were developed and tested. A new technique for sensing the distance between the probe and a conducting sur face via corona discharge current measurement was developed. A specific lock in system for detection of probe scattered pulse-periodic radiation, which includes a hot electron superconducting bolometer and an electronic signal storage circuit, was developed to operate with the Novosibirsk terahertz FEL. All elements of the microscope were tested, and their working capacity was demonstrated. Experiments on the detection of microscope probe scattered terahertz radiation have been initiated.

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Diagnostics of semiconductor structures by means of an apertureless near-field terahertz microscope

Trukhin

Golubo

Lyutetsky

et al. 2012

Radiophys Quantum El

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Interaction of terahertz electromagnetic radiation with a probe-object system in a terahertz apertureless near-field microscope

Cited by 14 publications

References 5 publications

Terahertz spectroscopy research on motion‐limited molecular chain of random polymethacrylate

Terahertz spectroscopy research on motion‐limited molecular chain of random polymethacrylate

A terahertz scanning near-field optical microscope with an attenuated total internal reflection module

Diagnostics of semiconductor structures by means of an apertureless near-field terahertz microscope

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