Ultrafast Pulse Generation in an Organic Nanoparticle-Array Laser

Daskalakis, Konstantinos S.; Väkeväinen, Aaro I.; Martikainen, Jani-Petri; Hakala, Tommi K.; Törmä, Païvi

doi:10.1021/acs.nanolett.8b00531

Cited by 38 publications

(45 citation statements)

References 29 publications

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“…It is important to remark that, since the modeling is not specific to semiconductor‐based devices but takes into account only the fundamentals of light–matter interactions leading to lasing, the autocorrelation resonance technique will be applicable also to nanosources based on solid‐state or organic materials once their technologies have sufficiently matured.…”

Section: Resultsmentioning

confidence: 99%

Onset of Lasing in Small Devices: The Identification of the First Threshold through Autocorrelation Resonance

2018

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A simple technique for identifying the onset of coherent emission in mesoscale lasers, which makes use of a small-amplitude modulation added to the pump, is introduced. The optimal modulation frequency is obtained from the radio-frequency power spectrum of the unperturbed laser emission. The identification of the lasing onset rests on the appearance of a resonance in the experimentally measured zero-order autocorrelation function (g (2) (0)) plotted as a function of the pump rate. Numerical proof is provided in support of the autocorrelation resonance. The intrinsic simplicity of this technique and its inherent compatibility with photon counting makes it an excellent tool for certifying the onset of laser emission independent of the laser cavity volume. Recently published measurements of g (2) (0), obtained in nanolasers, support the extension of this technique to nanoscale devices.

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Section: Resultsmentioning

confidence: 99%

Onset of Lasing in Small Devices: The Identification of the First Threshold through Autocorrelation Resonance

2018

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“…3(b). Over three orders of magnitude increase in emission intensity can be seen upon the onset of lasing, typical for nanoparticle arrays with small spontaneous emission coupling to the lasing mode (small β-factor [44]) [24,26,28,29,31]. Increased temporal coherence due to lasing is evident from the line width of the emission (2 meV), which is well below the natural line width of the SLR mode at the Kpoint (∼ 20 meV).…”

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confidence: 99%

Lasing at K Points of a Honeycomb Plasmonic Lattice

et al. 2019

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We study lasing at the high-symmetry points of the Brillouin zone in a honeycomb plasmonic lattice. We use symmetry arguments to define singlet and doublet modes at the K -points of the reciprocal space. We experimentally demonstrate lasing at the K -points that is based on plasmonic lattice modes and two-dimensional feedback. By comparing polarization properties to T -matrix simulations, we identify the lasing mode as one of the singlets with an energy minimum at the Kpoint enabling feedback. Our results offer prospects for studies of topological lasing in radiatively coupled systems.

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“…Besides the above‐mentioned systems, many other configurations for plasmonic lasers have been demonstrated using cavity modes from surface lattice plasmon mode in metal nanoparticles array, Tamm SPP mode, long‐range SPP mode, random mode to other diverse modes . Also, by operating at NIR region with relatively low metal losses, metal‐cladded 3D‐confined subdiffraction‐limit plasmonic nanolasers have been demonstrated, in which the cladding metals support TM cavity modes and behave more like perfect reflecting mirrors .…”

Section: Experimental Demonstrations Of the Plasmonic Nanolasersmentioning

confidence: 99%

Plasmonic Nanolasers: Pursuing Extreme Lasing Conditions on Nanoscale

Gao

et al. 2019

Advanced Optical Materials

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and techniques have been proposed and/ or developed. Here we focus on a newly emerging area-plasmonic nanolaser that pursuing extremely smaller cavity size in one or more dimensions, and consequently extreme lasing conditions, by using a plasmonic cavity with feature size possibly far below the diffraction limit of light.The miniaturization of a laser can be traced back to the early age of the laser, when compact semiconductor structures were introduced. In particular, the introduction of semiconductors as the gain media in 1962, [11,12] followed by a series of elaborately engineered structures from heterostructure, [13] quantum well, [14] vertical-cavity surface-emitting laser (VCSEL), [15,16] microdisk, [17][18][19] photonic crystal, [20][21][22] quantum dot [23,24] to nanowire (NW) [25][26][27] have made great success in shrinking a laser from bulk scale to wavelength level using reduced cavity sizes. [28] For example, to date, typical commercial edgeemitting quantum well laser diodes have dimensions of several micrometers in width and hundreds of micrometers in length, and a single quantum dot can lase in a photonic crystal cavity with overall dimension of merely 0.7(λ/n) 3 , where λ is the vacuum wavelength and n the refractive index of the dielectric. [29] With optimized geometry and material for cavity design, lower structural dimension is expected. However, in a dielectric cavity with limited refractive index n, the cavity size is intrinsically restricted by optical diffraction limit that sets an ultimate limit λ/2n for both cavity length and mode size in all three dimensions.An effective step to shrink a cavity beyond the diffraction limit is converting light into surface plasmon polaritons (SPPs) in nanostructuralized metals, which is a kind of collective oscillation of quasi free electrons on the interface of a metal and a dielectric. [30] While SPP is featured with ultrahigh optical confinement and ultrafast relaxation process as shown in Figure 1a, [31] it is inevitably accompanied by ultrahigh energy dissipation (i.e., Ohmic loss), leading to a mutual balance between the mode size and the optical loss in either a nanowaveguide or a nanocavity as shown in Figure 1b. [32] For example, the transverse mode area of SPP mode on an Ag nanowire with diameter of 100 nm can be as small as 0.01 µm 2 but also exhibits a propagation loss larger than 200 dB mm −1 . Despite of the high loss coefficient of plasmonic resonance at optical frequency, a properly designed nanoplasmonic cavity coupled with a gain medium is possible to lase with miniature cavity length.Owing to their ultrahigh optical confinement, plasmonic nanolasers with cavity sizes beyond the diffraction limit of light, are attracting increasing attention for pursuing extreme lasing conditions on nanoscale including ultracompact cavity mode, ultrafast lasing modulation, significantly enhanced light-matter interaction, and Purcell effect. In this review, the recent progress on plasmonic nanolasers from both theoretical and experimental aspects is intro...

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Ultrafast Pulse Generation in an Organic Nanoparticle-Array Laser

Cited by 38 publications

References 29 publications

Onset of Lasing in Small Devices: The Identification of the First Threshold through Autocorrelation Resonance

Onset of Lasing in Small Devices: The Identification of the First Threshold through Autocorrelation Resonance

Lasing at K Points of a Honeycomb Plasmonic Lattice

Plasmonic Nanolasers: Pursuing Extreme Lasing Conditions on Nanoscale

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