Excitation and temperature dependence of the broad gain spectrum in GaAs/AlGaAs quantum rings

Jang, Juyeong; Lee, Seunghwan; Kim, Min-Ju; Woo, Sunwoo; Kim, Inhong; Kyhm, Jihoon; Song, Jindong; Taylor, Robert A.; Kyhm, Kwangseuk

doi:10.1063/5.0020890

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…The effective localized area might be similar to that of CsPbBr 3 NPLs, where the area varies from 350 ∼ 1100 nm 2 . In this case, a 2D center-of-mass exciton confinement model can be considered [36], where the confinement levels are determined by a whole exciton instead of separate electrons and holes. As a result, the stochastic thickness variation possibly results in a broad spectral range with a different density of the states.…”

Section: Resultsmentioning

confidence: 99%

Modal gain enhancement of perovskite nanosheets by a patterned waveguide via spectral-length gain analysis

Taylor

Kim

Choi

et al. 2023

Preprint

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We have studied optical modal gain in two-dimensional perovskite nanostructures in terms of gain saturation and mode confinement, where CsPbBr3 nanosheets of large lateral size (80 ∼ 300 nm) and thin thickness (5 ∼ 8 nm) were stacked in a patterned waveguide of polyurethane-acrylate. Concerned with the uncertainties and pitfalls in retrieving gain coefficient from the variable stripe length method, we have obtained a gain contour g(ℏω, x), whereby gain saturation was analyzed in terms of both spectrum energy (ℏω) and stripe length (x). For increasing excitation and temperature, an average gain was also obtained from g(ℏω, x), where the two dimensional excitons and the localized states are involved. We found the waveguide enhances both modal gain and thermal stability due to the increased mode confinement and heat conduction.

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Section: Resultsmentioning

confidence: 99%

Modal gain enhancement of perovskite nanosheets by a patterned waveguide via spectral-length gain analysis

Taylor

Kim

Choi

et al. 2023

Preprint

Self Cite

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Gain enhancement of perovskite nanosheets by a patterned waveguide: excitation and temperature dependence of gain saturation

Kim,

Choi,

Mei

et al. 2023

Light Sci Appl

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Optical gain enhancement of two-dimensional CsPbBr3 nanosheets was studied when the amplified spontaneous emission is guided by a patterned structure of polyurethane-acrylate. Given the uncertainties and pitfalls in retrieving a gain coefficient from the variable stripe length method, a gain contour $$g(\hslash \omega ,x)$$ g ( ℏ ω , x ) was obtained in the plane of spectrum energy (ℏω) and stripe length (x), whereby an average gain was obtained, and gain saturation was analysed. Excitation and temperature dependence of the gain contour show that the waveguide enhances both gain and thermal stability due to the increased optical confinement and heat dissipation, and the gain origins were attributed to the two-dimensional excitons and the localized states.

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Polarization Angle Dependence of Optical Gain in a Hybrid Structure of Alexa-Flour 488/M13 Bacteriophage

et al. 2021

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We measured optical modal gain of a dye–virus hybrid structure using a variable stripe length method, where Alexa-fluor-488 dye was coated on a virus assembly of M13 bacteriophage. Inspired by the structural periodicity of the wrinkle-like virus assembly, the edge emission of amplified spontaneous emission was measured for increasing excited optical stripe length, which was aligned to be either parallel or perpendicular to the wrinkle alignment. We found that the edge emission showed a strong optical anisotropy, and a spectral etalon also appeared in the gain spectrum. These results can be attributed to the corrugated structure, which causes a similar effect to a DFB laser, and we also estimated effective cavity lengths.

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Excitation and temperature dependence of the broad gain spectrum in GaAs/AlGaAs quantum rings

Cited by 3 publications

References 17 publications

Modal gain enhancement of perovskite nanosheets by a patterned waveguide via spectral-length gain analysis

Modal gain enhancement of perovskite nanosheets by a patterned waveguide via spectral-length gain analysis

Gain enhancement of perovskite nanosheets by a patterned waveguide: excitation and temperature dependence of gain saturation

Polarization Angle Dependence of Optical Gain in a Hybrid Structure of Alexa-Flour 488/M13 Bacteriophage

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