A detailed investigation on the terahertz absorption characteristics of polydimethylsiloxane (PDMS)

Alfihed, Salman; Bergen, Mark H.; Holzman, Jonathan F.; Foulds, Ian G.

doi:10.1016/j.polymer.2018.08.025

Cited by 19 publications

(16 citation statements)

References 31 publications

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“…The 5 g PDMS mixture was then evacuated in a vacuum chamber for 30 min and cured within a 75 mm diameter Petri dish for 48 h at room temperature. Our prior studies have found that the THz absorption of PDMS increases as the curing temperature increases [ 25 ], and so this sample was cured over a long time at a low temperature. The measured thicknesses of the polymer samples, as measured at each centre, are shown in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

Characterization and Integration of Terahertz Technology within Microfluidic Platforms

et al. 2018

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In this work, the prospects of integrating terahertz (THz) time-domain spectroscopy (TDS) within polymer-based microfluidic platforms are investigated. The work considers platforms based upon the polar polymers polyethylene terephthalate (PET), polycarbonate (PC), polymethyl-methacrylate (PMMA), polydimethylsiloxane (PDMS), and the nonpolar polymers fluorinated ethylene propylene (FEP), polystyrene (PS), high-density polyethylene (HDPE), and ultra-high-molecular-weight polyethylene (UHMWPE). The THz absorption coefficients for these polymers are measured. Two microfluidic platforms are then designed, fabricated, and tested, with one being based upon PET, as a representative high-loss polar polymer, and one being based upon UHMWPE, as a representative low-loss nonpolar polymer. It is shown that the UHMWPE microfluidic platform yields reliable measurements of THz absorption coefficients up to a frequency of 1.75 THz, in contrast to the PET microfluidic platform, which functions only up to 1.38 THz. The distinction seen here is attributed to the differing levels of THz absorption and the manifestation of differing f for the systems. Such findings can play an important role in the future integration of THz technology and polymer-based microfluidic systems.

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Section: Methodsmentioning

confidence: 99%

Characterization and Integration of Terahertz Technology within Microfluidic Platforms

et al. 2018

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“…It can be observed that the trend of the Q ‐factor at ω 1 shows a linear increase with a maximum value of 50. The abovementioned electromagnetic performance is better than that obtained for other THz‐metamaterial devices reported in the literature . This result can be explained by the field distributions for the PSM in the TE and TM modes, as shown in Figure c.…”

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confidence: 61%

“…In this study, an active tuning approach for a THz metamaterial with an ultranarrow bandwidth is presented. The proposed device exhibits a larger scalability, higher polarization dependence, and larger tuning range compared to devices reported in the literature . Owing to the low stiffness with large proof mass of the PDMS‐based metamaterial, one can generate a large deformation by applying a small strain force.…”

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confidence: 99%

A Stretchable Terahertz Parabolic‐Shaped Metamaterial

Lin

2019

Advanced Optical Materials

103

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A stretchable parabolic‐shaped metamaterial (PSM) coated onto polydimethylsiloxane (PDMS) is proposed and demonstrated for operation in the terahertz (THz) frequency range. By stretching the PDMS‐based PSM device along different directions, ultranarrowband, polarization dependent, switchable optical characteristics are obtained. By stretching the PSM width and length in the transverse electric (TE) and transverse magnetic (TM) modes, resonant tuning ranges of 0.55 and 0.32 THz, respectively, are demonstrated for the PSM device. In these deformation ranges, the Q‐factors of the PSM device for different widths and lengths are quite stable and maintained in the range of 9 to 14 for the TE mode, with a high Q‐factor of 50 obtained at resonance for the TM mode. The integration of the PSM on a mechanically deformable PDMS substrate provides potential for use in flexible electronics applications. Furthermore, the PSM device exhibits single‐/dual‐band switching and polarization switching characteristics. These multifunctional states for the PSM device can be determined by mechanical inputs to represent binary digits that can then be used to perform logic operations. Such a stretchable PSM device offers an effective approach for the realization of programmable metamaterials with enhanced optical‐mechanical performance due to its high flexibility, applicability, and cost‐effectiveness.

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“…To this end, the ZnO QDs were harvested by drying the final solution on a hotplate maintained at 70˚C, and prior to dispersing them in the aforementioned matrix, the QD samples were thoroughly pulverized using a mortar. Once the solvent had completely evaporated, the ZnO QD powder was mixed with a PDMS solution that had been previously prepared by mixing 5 wt% of a curing agent in a silicone elastomer [19] [20]. The mixture of PDMS and ZnO QDs was then cured at 90˚C for 3 hours (see Figure 3).…”

Section: Zno Qd Synthesismentioning

confidence: 99%

Terahertz Modulation of Hexagonal-Shaped Metamaterials Employing ZnO Quantum Dots

Vazquez-Colon¹,

Flores-Pacheco²,

García-Monge³

et al. 2019

OJINM

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The utilization of UV excitation to verify the terahertz (THz) wave modulation of hexagonal-shaped metamaterial (MM) arrays coated with synthesized photoluminescent, down-shifting ZnO quantum dots (QDs) of two different radius sizes, namely, 3.00 nm (pH 10) and 2.12 nm (pH 12), respectively is reported. In order to characterize the behavior of the MM before and after deployment of the ZnO QDs, THz time domain spectroscopy in transmission mode was employed. Upon exposure to UV excitation, the collected amplitude modulation values were 9.21% for the pH 12 and 4.55% for the pH 10 ZnO QDs, respectively. It is anticipated that the ability to actively tune the performance of otherwise passive structures will promote the proliferation of THz signal modulation devices in the near future.

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A detailed investigation on the terahertz absorption characteristics of polydimethylsiloxane (PDMS)

Cited by 19 publications

References 31 publications

Characterization and Integration of Terahertz Technology within Microfluidic Platforms

Characterization and Integration of Terahertz Technology within Microfluidic Platforms

A Stretchable Terahertz Parabolic‐Shaped Metamaterial

Terahertz Modulation of Hexagonal-Shaped Metamaterials Employing ZnO Quantum Dots

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