Effect of Au substrate and coating on the lasing characteristics of GaAs nanowires

Aman, Gyanan; Mohammadi, Fatemesadat; Fränzl, Martin; Lysevych, Mykhaylo; Tan, Hark Hoe; Jagadish, Chennupati; Schmitzer, Heidrun; Cahay, M.; Wägner, Hans

doi:10.1038/s41598-021-00855-w

Cited by 5 publications

(10 citation statements)

References 56 publications

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“…Figure d shows the emission polarization measurement from the “FP system”, i.e., intensity recorded at different polarizations while keeping the excitation polarization constant. The lasing emission intensity changes for different detection angles with the highest PL emission along the NW . The degree of linear polarization, ρ = ( I ⊥ – I ∥ ) / ( I ⊥ + I ∥ ), , was determined to be 0.22 for the result shown in Figure d.…”

Section: Resultsmentioning

confidence: 99%

“…The lasing emission intensity changes for different detection angles with the highest PL emission along the NW. 61 The degree of linear polarization, ρ = (I ⊥ − I ∥ ) / (I ⊥ + I ∥ ), 62,63 was determined to be 0.22 for the result shown in Figure 2d. This property of the "FP system" can be utilized to modulate the polarization by tilting the NWs or to modulate the emission intensity based on the polarization of the excitation light.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Characteristics and Thermal Control of Random and Fabry–Pérot Lasing in Nanowire Arrays

et al. 2022

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Nanolasers have attracted intense interest in the past decade because they are more compact, can be operated at higher modulation speed, and are more power-efficient than classical lasers. Thanks to these capabilities, nanolasers are now emerging for a variety of practical applications. This work presents hybrid nanolasers supporting both Fabry–Pérot and random lasing modes at room and cryogenic temperatures. These lasing modes are shown to exhibit differences in their lasing properties, such as wavelength, polarization, and coherency. New practical and broadly applicable methods are presented to distinguish these modes, including polarization-resolved measurements, near-field imaging, and photoluminescence spectroscopy measurements. Importantly, this paper demonstrates tuning between different lasing types in nanolasers, i.e., between Fabry–Pérot and random lasing. This allows the tuning of several lasing properties beyond only wavelength tuning. Thermal tuning is used here, where the Fabry–Pérot lasing modes are dominant at cryogenic temperatures, and at room temperature, random lasing becomes dominant. This work presents the first NW dual-cavity nanolaser and the first demonstration of thermal tuning between laser cavity types. As such, it provides the foundation for hybrid nanolasers, where various lasing properties can be tuned.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Characteristics and Thermal Control of Random and Fabry–Pérot Lasing in Nanowire Arrays

et al. 2022

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“…[8] For Fabry-Perot cavities, this is defined by the end facets of the NW so that the NW length determines the longitudinal modes which can lase. [17] Mode confinement must also be considered, which is influenced by the NW width, the lasing wavelength, the lasing mode and the refractive index difference between the NW and the surroundings. [18] The reflectivity of the end facets impacts both the degree of optical feedback in the laser and the output coupling.…”

Section: Introductionmentioning

confidence: 99%

Holistic Nanowire Laser Characterization as a Route to Optimal Design

Church

Patel

Al-Abri

et al. 2023

Advanced Optical Materials

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Nanowire lasers are sought for near‐field and on‐chip photonic applications as they provide integrable, coherent, and monochromatic radiation: the functional performance (threshold and wavelength) is dependent on both the opto‐electronic and crystallographic properties of each nanowire. However, scalable bottom‐up manufacturing techniques often suffer from inter‐nanowire variation, leading to differences in yield and performance between individual nanowires. Establishing the relationship between manufacturing controls, geometric and material properties, and the lasing performance is a crucial step toward optimisation; however, this is challenging to achieve due to the interdependance of such properties. Here, a high‐throughput correlative approach is presented to characterise over 5000 individual GaAsP/GaAs multiple quantum well nanowire lasers. Fitting the spontaneous emission provides the threshold carrier density, while coherence length measurements determine the end‐facet reflectivity. The performance is intrinsically related to the width of a single quantum well due to quantum confinement and bandfilling effects. Unexpectedly, there is no strong relationship between the properties of the lasing cavity and the threshold: instead the threshold is negatively correlated with the non‐radiative recombination lifetime of the carriers. This approach therefore provides an optimisation strategy that is not accessible through small‐scale studies.

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“…Being a direct bandgap semiconductor, gallium arsenide (GaAs) possesses interesting optical properties to manipulate light-matter interactions in optoelectronic devices such as solar cells [14], nano-lasers [15], photodetectors [16], and light emitting diodes [17]. In this regard, extensive research has been conducted to enhance light absorption in ordered GaAs NW arrays.…”

Section: Introductionmentioning

confidence: 99%

Disorder induced absorption enhancement of light in GaAs nanowire array

Shahnewaz¹,

Iqbal²,

Baten³

et al. 2022

J. Opt.

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Light absorption characteristics of vertically aligned GaAs nanowire (NW) arrays with disordered diameters and heights are investigated in this work using finite diﬀerence time domain (FDTD) analysis technique. By varying the random height ranges, an optimum variation range of 1000-2000 nm is obtained that provides the maximum average absorbance at diﬀerent fill-factors of the arrays. An array having random heights of the nanowires within the optimized range is found to have better absorbance for both normal and oblique incidence of light compared to the uniform height structure. Even for 45 degree incidence angle of light, average absorbance is obtained to be 2% higher for the random-height array, compared to the case of absorbance obtained for the uniform height structure. The proposed arrays having random diameters provide up to 12.8 % improvement in short circuit current density whereas the random-height structure enhances the short circuit current density by 1.1 % compared to the arrays having uniform diameter and height. The present work also provides an eﬀective medium theory based theoretical model taking into account the random height variation of the arrays. The theoretically calculated values are found to be in good agreement with FDTD simulation results, thereby providing further guidelines for designing random array based high performance photonic devices.

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Effect of Au substrate and coating on the lasing characteristics of GaAs nanowires

Cited by 5 publications

References 56 publications

Characteristics and Thermal Control of Random and Fabry–Pérot Lasing in Nanowire Arrays

Characteristics and Thermal Control of Random and Fabry–Pérot Lasing in Nanowire Arrays

Holistic Nanowire Laser Characterization as a Route to Optimal Design

Disorder induced absorption enhancement of light in GaAs nanowire array

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