Abstract:Inorganic lead halide perovskite (CsPbX3, X = Cl, Br, I) nanowires (NWs) have been emerging in lasers due to their intriguing attributes of tunable wavelength, low-threshold, superior stability, and easy...
“…allowing mode selection effects. 20 However, FIB processing is extremely expensive, has a low output, and leads to the partial amorphization of NW material, which dramatically reduces the quantum yield of PL. Alternatively, most of the other lithography techniques 21−23 can hardly be adopted for the processing of individual assynthesized nanostructures as those typically have a variable thickness and disordered orientation on the substrate.…”
Halide
perovskite nanowire-based lasers have become a powerful
tool for modern nanophotonics, being deeply subwavelength in cross-section
and demonstrating low-threshold lasing within the whole visible spectral
range owing to the huge gain of material even at room temperature.
However, their emission directivity remains poorly controlled because
of the efficient outcoupling of radiation through their subwavelength
facets working as pointlike light sources. Here, we achieve directional
lasing from a single perovskite CsPbBr3 nanowire by imprinting
a nanograting on its surface, which provides stimulated emission outcoupling
to its vertical direction with a divergence angle around 2°.
The nanopatterning is carried out by the high-throughput laser ablation
method, which preserves the luminescent properties of the material
that is typically deteriorated after processing via conventional lithographic
approaches. Moreover, nanopatterning of the perovskite nanowire is
found to decrease the number of the lasing modes with a 2-fold increase
of the quality factor of the remaining modes.
“…allowing mode selection effects. 20 However, FIB processing is extremely expensive, has a low output, and leads to the partial amorphization of NW material, which dramatically reduces the quantum yield of PL. Alternatively, most of the other lithography techniques 21−23 can hardly be adopted for the processing of individual assynthesized nanostructures as those typically have a variable thickness and disordered orientation on the substrate.…”
Halide
perovskite nanowire-based lasers have become a powerful
tool for modern nanophotonics, being deeply subwavelength in cross-section
and demonstrating low-threshold lasing within the whole visible spectral
range owing to the huge gain of material even at room temperature.
However, their emission directivity remains poorly controlled because
of the efficient outcoupling of radiation through their subwavelength
facets working as pointlike light sources. Here, we achieve directional
lasing from a single perovskite CsPbBr3 nanowire by imprinting
a nanograting on its surface, which provides stimulated emission outcoupling
to its vertical direction with a divergence angle around 2°.
The nanopatterning is carried out by the high-throughput laser ablation
method, which preserves the luminescent properties of the material
that is typically deteriorated after processing via conventional lithographic
approaches. Moreover, nanopatterning of the perovskite nanowire is
found to decrease the number of the lasing modes with a 2-fold increase
of the quality factor of the remaining modes.
“…The observed mode-selection phenomenon can be understood with the Vernier effect, which is caused by the detuning (Δ)-dependent destructive interference 4 , 5 , 12 , 14 , 44 , 45 . In principle, the magnified free spectral range ( FSR enlarged ) of the Vernier envelope 46 , 47 can be expressed as a function of the FSRs of the two coupled microdisks where FSR right and FSR left are the FSRs of the two tangent microdisks.…”
Section: Resultsmentioning
confidence: 99%
“…Following the Vernier effect (Fig. 4b ), once PMs is activated under NIR right excitation, most of the modes leak into the passive cavity through the joint area except for the selected modes, which satisfy the following equation: mFSR left = nFSR right (i.e., where m and n should be co-prime integers) 4 , 5 , 12 , 14 , 44 , 45 . Fig.…”
The development of multi-wavelength lasing, particularly with the wavelength tuning in a wide spectral range, is challenging but highly desirable for integrated photonic devices due to its dynamic switching functionality, high spectral purity and contrast. Here, we propose a general strategy, that relies on the simultaneous design on the electronic states and the optical states, to demonstrate dynamically switchable single-mode lasing spanning beyond the record range (300 nm). This is achieved through integrating the reversely designed nanocrystals with two size-mismatched coupled microcavities. We show an experimental validation of a crosstalk-free violet-to-red single-mode behavior through collective control of asymmetric excitation and excitation wavelength. The single-mode action persists for a wide power range, and presents significant enhancement when compared with that in the microdisk laser. These findings enlighten the reverse design of luminescent materials. Given the remarkable doping flexibility, our results may create new opportunities in a variety of frontier applications.
“…Recently, all-inorganic halide CsPbX 3 (X = Cl, Br, and I) perovskite quantum dots (QDs) have attracted significant attention owing to their excellent optical properties, such as high photoluminescence quantum yields (PLQY), narrow emission band, and tunable emission wavelength. [1][2][3] Due to these unique characteristics, perovskite QDs have been exploited for diverse applications, such as lasers, 4 light-emitting diodes (LEDs), 1,5 solar cells, 6 displays, 7 and photodetectors. 8 However, the applications of all-inorganic colloidal perovskite QDs have been limited due to their poor stability, which have stimulated continuous efforts in searching for methods for enhancing their stability.…”
CsPbI 3 perovskite quantum dots (QDs) doped borosilicate glass was prepared by the process of melt-quenching and subsequent annealing. With the introduction of ZnO to the parent glass as the glass network intermediate, the optical properties of the resultant samples are dramatically enhanced. Both the photoluminescence (PL) intensity and photoluminescence quantum yield (PLQY) shows a strong dependence on ZnO concentration as ZnO is found to facilitate the precipitated of the QDs by reducing the connectivity of three-dimensional glass network built from SiO 4 tetrahedrons. The tunable visible-band PL emission of the CsPbI 3 QD-doped glass could find potential applications in white LEDs and lasers.
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