Fabrication of Ge micro-disks on free-standing SiO2 beams for monolithic light emission

Al-Attili, Abdelrahman; Husain, Muhammad; Gardès, Frédéric; Arimoto, Hideo; Saito, Shinichi; Higashitarumizu, Naoki; Ishikawa, Yasuhiko; Kako, Satoshi; Iwamoto, Satoshi; Arakawa, Yasuhiko

doi:10.1109/nano.2015.7388863

2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO) 2015

DOI: 10.1109/nano.2015.7388863

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Fabrication of Ge micro-disks on free-standing SiO2 beams for monolithic light emission

Abdelrahman Al-Attili

Muhammad Husain

Frédéric Gardès

et al.

Abstract: Abstract-Realizing a germanium (Ge)-based monolithic light source requires high n-type doping, tensile strain, and an optical cavity. Here, we demonstrate the application of spin-on doping technique, and the use of free-standing structures to induce tensile strain on Ge micro-disks, which act as a simple micro-cavity.

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2022

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Chiral germanium micro-gears for tuning orbital angular momentum

Al-Attili

Burt

Zuo

et al. 2022

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Group IV light sources with vertical emission and non-zero orbital-angular momentum (OAM) promise to unlock many novel applications. In this report, we demonstrate cylindrically symmetrical germanium micro-gear cavities, fabricated by etching a grating around the circumference of standard micro-disks, with periods ranging from 14 to 22. Photoluminescence (PL) measurements were done to identify the confined whispering-gallery modes (WGM). Finite-difference time-domain (FDTD) simulations were conducted to map the resonant modes to their modal profiles and characteristics. Vertical emission of WGMs with non-zero OAM was demonstrated, with a clear dependence of the OAM order ($$\ell$$ ℓ ) on the WGM azimuthal order and the number of micro-gear grating periods. As the chirality, or the direction of rotation, is not controlled in a symmetrical cavity, we propose introducing staircase or triangular-shaped gear periods resulting in an asymmetry. By choosing the diameter, number of periods, and the asymmetrical direction of the gear-teeth, it is possible to generate OAM signals with certain wavelength, OAM order and chirality.

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Chiral germanium micro-gears for tuning orbital angular momentum

Al-Attili

Burt

Zuo

et al. 2022

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

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Fabrication of Ge micro-disks on free-standing SiO2 beams for monolithic light emission

Cited by 1 publication

References 17 publications

Chiral germanium micro-gears for tuning orbital angular momentum

Chiral germanium micro-gears for tuning orbital angular momentum

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