Ultrafast control of fractional orbital angular momentum of microlaser emissions

Zhang, Zhifeng; Zhao, Haoqi; Pires, Danilo Gomes; Qiao, Xingdu; Gao, Zihe; Jornet, Josep Miquel; Longhi, Stefano; Litchinitser, Natalia M.; Feng, Liang

doi:10.1038/s41377-020-00415-3

Cited by 44 publications

(12 citation statements)

References 50 publications

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“…Passive control of OAM chirality is possible using complex designs such as spirals 18 , 19 , or plasmonic-photonic techniques 20 . More recently demonstrations of active control of chirality were also reported 21 .…”

Section: Introductionmentioning

confidence: 95%

Chiral germanium micro-gears for tuning orbital angular momentum

Al-Attili

Burt

Zuo

et al. 2022

Sci Rep

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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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Section: Introductionmentioning

confidence: 95%

Chiral germanium micro-gears for tuning orbital angular momentum

Al-Attili

Burt

Zuo

et al. 2022

Sci Rep

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“…Nanoscale coherent light generations via stimulated emissions have been the scientific frontier of nanophononics, topological photonics [1][2][3] , non-Hermitian physics [4][5][6] and optics in random media 7,8 . From the viewpoint of technology, the scalable creations of miniaturized lasers with lowpower consumption enable a variety of important applications across optical interconnects 9,10 , bio-sensing 11 and farfield beam synthesis 12,13 etc. To achieve lasing at the extreme sub-wavelength scale, plasmonic cavities are usually employed however they unavoidably suffer from high Ohmic losses associated with metals 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Low-threshold nanolasers based on miniaturized bound states in the continuum

Yu¹,

Li²,

Liu³

et al. 2022

Preprint

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The pursuit of compact lasers with low-thresholds has imposed strict requirements on tight light confinements with minimized radiation losses. Bound states in the continuum (BICs) have been recently demonstrated as an effective mechanism to trap light along the out-of-plane direction, paving the way to low-threshold lasers. To date, most reported BIC lasers are still bulky due to the absence of in-plane light confinement. In this work, we combine BICs and photonic band gaps to realize three-dimensional (3D) light confinements, as referred to miniaturized (mini-) BICs. Together with 3D carrier confinements provided by quantum dots (QDs) as optical gain materials, we have realized highly-compact active BIC resonators with a record-high quality (Q) factor up to 32500, which enables single-mode continuous wave (CW) lasing with the lowest threshold of 80 W/cm 2 among the reported BIC lasers. In addidtion, our photon statistics measurements under both CW and pulsed excitations confirm the occurence of the phase transition from spontaneous emission to stimulated emission, further suggesting that conventional criteria of input-output and linewidth are not sufficient for claiming nanoscale lasing. Our work reveal a via path towards compact BIC lasers with ultra-low power consumption and potentially boost the applications in cavity quantum electrodynamics (QEDs), nonlinear optics and integrated photonics.

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“…This ability to confine and trap light has enabled several scientific breakthroughs over the past few decades. Importantly, recent technological progress in micro-and nano-fabrication has enabled the realization of on-chip optical resonators with spatial dimensions comparable to the wavelength of the trapped light, or even smaller [1] with a wide range of applications including microlasers [2][3][4][5][6][7][8] and sensing [9][10][11][12][13][14], just to mention few examples. Despite the large variety in their designs (microrings, microdisks, photonic crystals, Bragg structures, etc.…”

Section: Introductionmentioning

confidence: 99%

The missing link between standing- and traveling-wave resonators

et al. 2022

Self Cite

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Optical resonators are structures that utilize wave interference and feedback to confine light in all three dimensions. Depending on the feedback mechanism, resonators can support either standing- or traveling-wave modes. Over the years, the distinction between these two different types of modes has become so prevalent that nowadays it is one of the main characteristics for classifying optical resonators. Here, we show that an intermediate link between these two rather different groups exists. In particular, we introduce a new class of photonic resonators that supports a hybrid optical mode, i.e. at one location along the resonator the electromagnetic fields associated with the mode feature a purely standing-wave pattern, while at a different location, the fields of the same mode represent a pure traveling wave. The proposed concept is general and can be implemented using chip-scale photonics as well as free-space optics. Moreover, it can be extended to other wave phenomena such as microwaves and acoustics.

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Ultrafast control of fractional orbital angular momentum of microlaser emissions

Cited by 44 publications

References 50 publications

Chiral germanium micro-gears for tuning orbital angular momentum

Chiral germanium micro-gears for tuning orbital angular momentum

Low-threshold nanolasers based on miniaturized bound states in the continuum

The missing link between standing- and traveling-wave resonators

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