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11. Terahertz reflective metasurfaces realize wavefront modulation of circular polarization channels.

Author

Xin, Jinhao, Yang, Jinxin, and Song, Zhengyong

Subjects
*CIRCULAR polarization, *GEOMETRIC quantum phases, *DEGREES of freedom, *AMPLITUDE modulation, *OPTICAL modulation, *OPTICAL devices, *WAVEFRONTS (Optics)
Abstract

The emergence of many efficient optical field modulation methods and planar optical devices is attributed to the continuous research of geometric phase. Nevertheless, conjugate symmetry of the geometric phase limits the multiplexing of metasurfaces. To overcome this limitation, integrating the propagation phase and the geometric phase to achieve self-decouped metasurfaces can effectively double channel capacity. Herein, a more in-depth derivation of Jones matrices is conducted, leveraging two degrees of freedom offered by the propagation phase and the geometric phase. This approach enables complete modulation in circular polarization channels. By designing the phase difference between a fast axis and a slow axis, energy allocation between different channels can be controlled. It means independent complex amplitude modulation is achieved. On this basis, the geometric phase is introduced to realize tri-channel multiplexing metasurfaces. To verify the feasibility of this method, two metasurfaces are designed, including a bifocal metasurface with adjustable energy allocation and a tri-channel multiplexing metasurface. The proposed multifunctional metasurface offers new insights into wavefront multiplexing for communication systems. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Inkjet printing at high resolution

Author

Yang, Jinxin and Derby, Brian

Abstract

Inkjet printing has been used as a manufacturing tool for a wide range of applications beyond its original use for text and graphics printing. This thesis aims to investigate the stability and electrical properties of inkjet printed line structures at high spatial resolution, using piezoelectric drop on demand (DOD) printing and electro-hydrodynamic (EHD) inkjet printing. An experimental study of the stability of lines produced by DOD printing drops of volume in the range 1 -10 pL using an ink/substrate combination with zero receding contact angle is presented. These results are used to validate existing models of the limiting bounds for the formation of stable parallel-sided lines as a function of drop spacing and printing speed. The model for the maximum drop spacing bound shows good agreement with our results. The minimum drop spacing bound is limited by a bulging instability and our results agree with the existing model, except for the printings with large drop volumes at low temperature. It is shown that in this circumstance there is a different mechanism for bulging that occurs after printing over a period of minutes, if the liquid bead is present on the surface for a significant period of time before drying. A study of the stability of lines printed on ink/substrate combinations with finite receding contact angles is also presented, over the same range of droplet size as the zero receding contact angle work. In this case, all the printed structures are found to be unstable, showing either individual large drops or continuous lines showing irregular periodic bulges at lower values of advancing and receding contact angles. The morphology change is shown to be due to the change of boundary conditions for the liquid bead at decreased contact angle. A dynamic model based on previous analysis methods is developed to predict the mean wavelength of the bulging morphology. It is further shown that stabilized line structures can be obtained on substrates with finite receding contact angle by pre-depositing droplets to generate small regular disturbances that initiate the formation of controlled periodic bulges, thus making the ridges relatively stable due to loss of liquid to the adjacent bugles. Finally, a study is presented on the stability and electrical properties of lines printed at ultra high resolution using an EHD inkjet printing system. Stable DOD EHD printing using femtolitre volume droplets is achieved by controlling the flow rate and pulse width time. The stability model for the formation of parallel-sided lines is shown to agree well with the results on the low contact angle silicon substrates and also with results in the literature. However, large deviations were observed for results from high contact angle substrates. We hypothesize that this is possibly due to the deviations from the calculated ejected volume per pulse. Stable inkjet printed line electrodes with sub ten micrometre width are successfully achieved, with conductivities within an order of magnitude of bulk silver.

Published
2021

33. How and when goal-oriented self-regulation improves college students' well-being: A weekly diary study

Author

Wang, Huatian, Yang, Jinxin, and Li, Peikai

Subjects
College students -- Social aspects -- Psychological aspects, Psychological research, Self-control -- Research, Goals (Psychology) -- Social aspects, Quality of life -- Psychological aspects, Psychology and mental health
Abstract

This study investigates how (i.e., through what mechanism) and when (i.e., under what conditions) goal-oriented self-regulation behaviors improve college students' psychological well-being. On the basis of data from 74 s-year Chinese college students in a weekly diary study (296 observations), we conducted a moderated mediation model and found that goal-oriented self-regulations behaviors (i.e., planning, monitoring, controlling, and reflecting) were positively related to college students' psychological well-being through increased academic performance. Further, such an indirect effect was stronger when college students' optimism and social support were high. This study contributes to student development and self-regulation literature by underscoring that academic performance plays a vital intermediate role in the relationship between self-regulation behaviors and college students' psychological well-being. Besides, we highlight that optimism and social support act as important personal and social resources for college students that can better unleash the positive effects of goal-oriented self-regulation behaviors., Author(s): Huatian Wang [sup.1] , Jinxin Yang [sup.2] , Peikai Li [sup.3] Author Affiliations: (1) grid.6852.9, 0000 0004 0398 8763, Department of Industrial Engineering and Innovation Sciences, Eindhoven University of [...]

Published
2022
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