All-colloidal parity–time-symmetric microfiber lasers balanced between the gain of colloidal quantum wells and the loss of colloidal metal nanoparticles

Foroutan, Sina; Shabani, Farzan; Isik, Ahmet Tarik; Dikmen, Zeynep; Demir, Hilmi Volkan

doi:10.1039/d2nr02146c

Cited by 3 publications

(2 citation statements)

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“…To have a WGM cavity, we designed a single‐layered microdisk structure that includes a CQW layer. Although different types of WGM resonators, such as microspheres [ 11 ] and fiber lasers, [ 29 ] could be employed to show single‐color lasing, we selected the microdisk structure due to its compatibility with our multicolor ASE configuration. The proposed microdisk laser allows for modification of the lateral axes of the ASE structure by patterning without changing the vertical axis.…”

Section: Resultsmentioning

confidence: 99%

“…[19][20][21][22] Various studies have been conducted to realize low-threshold single-color optical gain for colloidal quantum dots (QDs) and their 2D counterparts, colloidal quantum wells (CQWs). [23,24] Through the integration of these nanomaterials into different optical feedback configurations, such as Fabry-Pérot type cavity, [25] vertical cavity surface emitting laser (VCSEL), [26,27] WGM resonator, [28,29] DFB laser, [30] and single-color colloidal lasers have been demonstrated. Moreover, broadband multicolor amplified spontaneous emission (ASE) and random lasing have been shown using a particular type of colloidal nanocrystals with large core and shell sizes.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Dual‐Color Amplified Spontaneous Emission and Lasing from Colloidal Quantum Well Gain Media in their Own Layered Waveguide and Cavity

Isik

Shabani

Işık

et al. 2023

Laser & Photonics Reviews

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Micro/nanoscale semiconductor multicolor lasers offer great potential for enhanced‐performance photonic circuits. Colloidal quantum wells (CQWs) are excellent candidates as active materials for these platforms owing to their superior properties including suppressed Auger recombination and large absorption cross‐section. In this work, multicolor optical gain and lasing from the heterostructures of CQWs as the gain media in their own all‐solution processed optical cavity are proposed and demonstrated for the first time. Here, using a simple waveguide slab consisting of the thin films of green‐emitting CdSeS/Cd0.1Zn0.9S core/hot‐injection‐shell grown CQWs and red‐emitting CdSe/CdS@CdZnS core/crown@shell CQWs, a transparent low refractive index colloidal spacing layer of silica nanoparticles (NPs) is devised that critically suppresses otherwise detrimental nonradiative energy transfer between the green and red‐emitting CQWs. This multilayer configuration is key to enabling simultaneous amplified spontaneous emission behavior in two colors with low threshold levels. This layered architecture is further adapted to a whispering‐gallery‐mode cavity by fabricating a microdisk pattern directly out of these CQWs‐NPs‐CQWs colloids. The resulting device exhibits dual‐color multimode lasing both at 569 and 648 nm at the same time. This unique multicolor lasing layered architecture holds great promise for on‐chip photonic applications such as dual‐color biological imaging.

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Section: Resultsmentioning

confidence: 99%