Ultrahigh-Q metallic nanocavity resonances with externally-amplified intracavity feedback

Yoon, Jae Woong; Song, Seok Ho; Magnusson, Robert

doi:10.1038/srep07124

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…We further investigate feasibility of the inverse-cavity structure for plasmonic lasers which potentially enable extremely small lasers taking advantages of deep subwavelength confinement and ultrafast dynamic properties 24 . We consider a periodic array of metal–insulator-metal (MIM) nanocavities in an Au-InGaAs-InP system as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Inverse-cavity structure for low-threshold miniature lasers

Kim

Song

Yoon

2022

Sci Rep

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Creating micro and nano lasers, high threshold gain is an inherent problem that have critically restricted their great technological potentials. Here, we propose an inverse-cavity laser structure where its threshold gain in the shortest-cavity regime is order-of-magnitude lower than the conventional cavity configurations. In the proposed structure, a resonant feedback mechanism efficiently transfers external optical gain to the cavity mode at a higher rate for a shorter cavity, hence resulting in the threshold gain reducing with decreasing cavity length in stark contrast to the conventional cavity structures. We provide a fundamental theory and rigorous numerical analyses confirming the feasibility of the proposed structure. Remarkably, the threshold gain reduces down by a factor ~ 10−3 for a vertical-cavity surface-emitting laser structure and ~ 0.17 for a lattice-plasmonic nanocavity structure. Therefore, the proposed approach may produce extremely efficient miniature lasers desirable for variety of applications potentially beyond the present limitations.

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Section: Resultsmentioning

confidence: 99%

Inverse-cavity structure for low-threshold miniature lasers

Kim

Song

Yoon

2022

Sci Rep

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Ultra-high quality factor metallic micro-cavity based on concentric double metal-insulator-metal rings

Jiang

Zhang

et al. 2017

Sci Rep

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We propose and numerically investigate a novel ultra-high quality (Q) factor metallic micro-cavity based on concentric double metal-insulator-metal (MIM) rings (CDMR). In this CDMR cavity, because of the angular momentum matching, the strong coupling occurs between the same order modes of the inner and outer rings with huge resonance frequency difference. Consequently, the energy distribution between in the inner and outer rings presents enormous difference. Especially, for the quasi-in-phase CDMR modes, the energy is confined in the inner ring mainly, which suppresses the radiation loss greatly and results in ultra-narrow resonance dips and ultra-high Q factors. The full width at half-maximum (FWHM) of this CDMR cavity can be less than 2 nm and the Q factor can be higher than 300. Moreover, the character of this CDMR metallic micro-cavity can be modulated by varying the gap width between the two MIM rings. Our CDMR metallic micro-cavity provides a new perspective to design the advanced optical cavity with high Q factor and small mode volumes.

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Quality Factor Improvement for Nano Cavity

Abbas¹,

Mohammed²

2015

IJCA

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In this paper, the increasing of quality factor in the stimulated amplification of surface plasmon polaritons at visible frequencies was reported. Laser science has been successful in producing high powered, faster, and smaller coherent light sources. Such lasers are restricted, both in optical mode size and physical device dimension, to being larger than half the wavelength of the optical field, and it remains a key fundamental challenge to realize ultra-compact lasers that can directly generate coherent optical fields at the nanometer scale, far beyond the diffraction limit. A way of addressing this issue is to make use of surface plasmons, which are capable of tightly localizing light, but so far ohmic losses at optical frequencies have inhibited the realization of truly nanometer-scale lasers based on such approaches. We design a plasmonic laser with quality factor equal 900 at wavelength 500 nm.

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Ultrahigh-Q metallic nanocavity resonances with externally-amplified intracavity feedback

Cited by 3 publications

References 36 publications

Inverse-cavity structure for low-threshold miniature lasers

Inverse-cavity structure for low-threshold miniature lasers

Ultra-high quality factor metallic micro-cavity based on concentric double metal-insulator-metal rings

Quality Factor Improvement for Nano Cavity

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