Metalens for polarization conversion and focusing of laser light

Stafeev, Sergey S.; Nalimov, Anton G.; Kotlyar, V. V.

doi:10.1088/1742-6596/1368/2/022035

J. Phys.: Conf. Ser.

2019

DOI: 10.1088/1742-6596/1368/2/022035

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Metalens for polarization conversion and focusing of laser light

Sergey S. Stafeev

Anton G. Nalimov

V. V. Kotlyar

Abstract: We investigated 16-sector metalens that converts linearly polarized laser light to azimuthally polarized optical vortex and focuses the beam. It was shown that the metalens produces a focal spot with subwavelength diameters: FWHMx = 0.32λ and FWHMy = 0.51λ (experiment) and FWHMx=0.37λ и FWHMy=0.49λ (FDTD-simulation).

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Middle school students’ experiences and perceptions about flipped classroom applications used in geometry lessons

ÇAKIROĞLU,

PİŞKİN TUNÇ

2022

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The purpose of the study was to investigate the experiences and perceptions of middle school students about the flipped classroom applications used in geometry lessons. The research was designed as a case study. Data were collected through field notes, focus group interviews, and semi-structured interviews. The sample consisted of 26 eighth-grade students studying in a state middle school in Turkey. Within the scope of the flipped classroom, lecture videos and summaries, multimedia activities, and exercises were sent to the students through the Education Information Network (EIN) lesson module. The results indicated that students could control their learning at their pace and the lesson module were generally comprehensible. Moreover, the in-class activities enabled students to learn mathematics in a meaningful and in-depth manner. There was enough time for the application and implementation of classroom tasks. Furthermore, students learned better by getting support from their friends in the group, the interaction between student-student and student-teacher improved, and they were actively involved in the lessons. Additionally, students' bias towards mathematics decreased.

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Middle school students’ experiences and perceptions about flipped classroom applications used in geometry lessons

ÇAKIROĞLU,

PİŞKİN TUNÇ

2022

ADN

View full text Add to dashboard Cite

show abstract

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Metalens for polarization conversion and focusing of laser light

Cited by 1 publication

References 15 publications

Middle school students’ experiences and perceptions about flipped classroom applications used in geometry lessons

Middle school students’ experiences and perceptions about flipped classroom applications used in geometry lessons

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