Plasmonic Quantum Dot Nanolaser: Effect of “Waveguide Fermi Energy”

Jabir, Jamal N.; Ameen, Sabah M.M.; Al-Khursan, Amin H.

doi:10.1007/s11468-019-00981-2

“…It is checked with experimental results in 36 and used in many publications that deal with optical properties like 34,35,37,38 . Some of them deal with plasmonic nanostructures [39][40][41] . The parameters used in the calculations are listed in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Energy absorbed from double quantum dot-metal nanoparticle hybrid system

Akram

¹

,

Abdullah

²

,

Al-Khursan

³

2022

Sci Rep

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This work proposes the double quantum dot (DQD)-metal nanoparticle (MNP) hybrid system for a high energy absorption rate. The structure is modeled using density matrix equations that consider the interaction between excitons and surface plasmons. The wetting layer (WL)-DQD transitions are considered, and the orthogonalized plane wave (OPW) between these transitions is considered. The DQD energy states and momentum calculations with OPW are the figure of merit recognizing this DQD-MNP work. The results show that at the high pump and probe application, the total absorption rate $$({Q}_{tot})$$ ( Q tot ) of the DQD-MNP hybrid system is increased by reducing the distance between DQD-MNP. The high $${Q}_{tot}$$ Q tot obtained may relate to two reasons: first, the WL washes out modes other than the condensated main mode. Second, the high flexibility of manipulating DQD states compared to QD states results in more optical properties for DQD. The $${Q}_{DQD}$$ Q DQD is increased at a small MNP radius on the contrary to the $${Q}_{MNP}$$ Q MNP which is increased at a wider MNP radius. Under high tunneling, a broader blue shift in the $${Q}_{tot}$$ Q tot due to the destructive interference between fields is seen and the synchronization between $${Q}_{MNP}$$ Q MNP and $${Q}_{DQD}$$ Q DQD is destroyed. $${Q}_{tot}$$ Q tot for the DQD-MNP is increased by six orders while $${Q}_{DQD}$$ Q DQD is by eight orders compared to the single QD-MNP hybrid system. The high absorption rate of the DQD-MNP hybrid system comes from the transition possibilities and flexibility of choosing the transitions in the DQD system, which strengthens the transitions and increases the linear and nonlinear optical properties. This will make the DQD-MNP hybrid systems preferable to QD-MNP systems.

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“…Subband energies are first calculated through the quantum disk model used in [17] and compared with the experiment. It is used in many articles like [18][19][20]. The QDs, through the self-organization growth mode, suffer from size and shape fluctuations.…”

Section: Theorymentioning

confidence: 99%

Optical gain of Cd_xZn₁₋_xTe quantum dot structures

Abdullah,

Al‐Nashy,

Al‐Khursan

2023

Micro & Nano Letters

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Gain spectra of undoped and doped quantum dot (QD) structures are studied under the inhomogeneous broadening assumption at four mole fractions . For the QD structure, two peaks appear due to the excited state (ES) and ground state (GS) transitions. The gain for the doped structures doubles the undoped ones. The gain increases while the wavelength is reduced with increasing Cd content due to the broader band discontinuity between the QD states. The discontinuity of the bands for each structure (mole fraction) is calculated, which is one of the merits of this work. While the structure offers the peak wavelengths 470 and 630 nm, other mole fractions offer the wavelengths between them. These visible bands are essential in different applications. The effect of QD size effect is also examined. The wavelength is extended by 20 nm for each 1 nm QD height increment.

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“…Amplified spontaneous emission (ASE) measurements of a quantum-well coupled quantum-dot (QW–QD) laser are investigated in the QW–QD laser consists of an auxiliary QW which assists in carrier collection while tunneling of carriers takes place from the well to the dot region, revealing a low linewidth enhancement factor over a flat spectrum for these GaAs–InGaAs–InAs QW–QD lasers 14 . Moreover, QD structures emit ultraviolet (UV) wavelength by varying the boron mole fraction in the QD active region or the barrier, the total polarization of which is decreasing for the Al-containing systems 15 .The high net modal gain was obtained when the waveguide Fermi energy was considered which meant that the increment comes from the material gain, not from the confinement factor 16 . DQW MLLs have higher output power and Electro-optic conversion efficiency than QD MLLs, and multi-section DQW MLLs also can generate shorter pulse 17 .…”

Section: Introductionmentioning

confidence: 99%

Modal gain characteristics of a two-section InGaAs/GaAs double quantum well passively mode-locked laser with asymmetric waveguide

Qiao

¹

,

Li

²

,

Sia

³

et al. 2022

Sci Rep

1

0

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Monolithic two-section InGaAs/GaAs double quantum well (DQW) passively mode-locked lasers (MLLs) with asymmetric waveguide, consisting of the layers of p-doped AlGaAs waveguide and no-doped InGaAsP waveguide, emitting at ~ 1.06 μm, with a fundamental repetition rate at ~ 19.56 GHz have been demonstrated. Modal gain characteristics, such as a gain bandwidth and a gain peak wavelength of the MLL, as a function of the saturable absorber (SA) bias voltage (Va) as well as the injection current of gain section (Ig), were investigated by the Hakki-Paoli method. With the increase of Va, the lasing wavelength and net modal gain peak of the MLL both exhibited red-shifts to longer wavelength significantly, while the modal gain bandwidth was narrowed. Both the net modal gain bandwidth and gain peak of the MLL followed a polynomial distribution versus the reverse bias at the absorber section. In addition, for the first time, it was found that Va had an obvious effect on the modal gain characteristics of the MLL.

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Plasmonic Quantum Dot Nanolaser: Effect of “Waveguide Fermi Energy”

Cited by 17 publications

References 21 publications

Energy absorbed from double quantum dot-metal nanoparticle hybrid system

Energy absorbed from double quantum dot-metal nanoparticle hybrid system

Optical gain of Cd_xZn₁₋_xTe quantum dot structures

Modal gain characteristics of a two-section InGaAs/GaAs double quantum well passively mode-locked laser with asymmetric waveguide

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Plasmonic Quantum Dot Nanolaser: Effect of “Waveguide Fermi Energy”

Cited by 17 publications

References 21 publications

Energy absorbed from double quantum dot-metal nanoparticle hybrid system

Energy absorbed from double quantum dot-metal nanoparticle hybrid system

Optical gain of CdxZn1−xTe quantum dot structures

Modal gain characteristics of a two-section InGaAs/GaAs double quantum well passively mode-locked laser with asymmetric waveguide

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Product

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Optical gain of Cd_xZn₁₋_xTe quantum dot structures