Strong Coupling of an Emitter with Absorbing Matter: A Regime for Enhancement of Light Emission

Jain, Kritika; Venkatapathi, Murugesan

doi:10.1103/physrevapplied.11.054002

Cited by 7 publications

(14 citation statements)

References 57 publications

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“…An extension to the theory of density of optical states was shown to be required to include effects of strong coupling of an emitter with absorbing matter, and was presented elsewhere considering dipole emitters 17 . This extension removed the anomalous divergence of observed enhancements of photoluminescence and fluorescence in case of limiting small metal nanoparticles, and also surface-enhanced-Ramanspectroscopy where only emitters with very small separations with the metal are typically excited.…”

Section: Theoretical Methodsmentioning

confidence: 99%

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Large emission enhancement and emergence of strong coupling with plasmons in nanoassemblies: Role of quantum interactions and finite emitter size

et al. 2019

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1 Experimental Methods: a) Materials: Cadmium oxide (CdO) powder, Zinc oxide (ZnO), Trioctylphosphine (T OP ), Selenium powder, Sulphur, Oleic acid (OA), ODE, Chloroform and Toluene, were obtained from Sigma-Aldrich (Germany) for the synthesis of QDs. Dodecanethiol (DDT ), HAuCl 4 , N aBH 4 granules, N aOH, Hexene also procured from Sigma-Aldrich and Acetone,hexane, HCL from HDFCL for AuNP synthesis. Deionized water (18.2 Megaohms-cm, Milipore) was used for all Langmuir-Blodgett (LB) film transfer. b) Synthesis and characterization of Quantum Dot: The CdSe-ZnS core-shell quantum dots are prepared traditional hot-injection synthesis of CdSe cores followed by slow growth of a ZnS shell from solution. CdO and ZnO are mixed and dissolved in OA and ODE and the mixture is heated up to 310 deg C to get clear solution and then inject required amount of TOP-S and TOP-Se stock solution in the three neck flux containing hot Cadmium based growth solution. After injection, we maintain a constant temperature of 300 deg C for desired amount of time to get proper size of QD. This quantum dot has Cadmium selenide (CdSe) spherical core and it is covered by Zinc-Selenide (ZnS) shell. By keeping the temperature constant at 300 degree for 10 min, the formed QD has diameter around 6.7 nm and Photoluminescence emission at wavelength 570 nm. c)Synthesis and characterization of Gold Nano Praticle: Gold nanoparticles (AuNP) are made in water by borohydride reduction and phase-transferred to hexane. This dodecanethiolate-protected gold nanoparticles synthesis is a fast process and does not require a cleaning step. The stock solution of 50 mM gold chloride was made by dissolving HAuCl 4 − 3H 2 O with the same molar concentration of HCl in a glass vial and the aqueous stock solution of 50 mM borohydride was made by dissolving N aBH 4 granules with the same molar amount of N aOH. Now 100 µL of the AuCl 4 solution added with water and later injected 300 µL of the borohydride solution to that while stirring the mixture on a mechanical shaker for uniform * murugesh@iisc.ac.in † basu@iisc.ac.in

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Section: Theoretical Methodsmentioning

confidence: 99%

“…In the strong-coupling regime, it was shown that the a significant fraction of non-radiative component of the dipole mode of metal nanoparticle can manifest as a radiative component 17 . There, the expressions represented a single point dipole emitter interacting with a metal nanostructure.…”

Section: Theoretical Methodsmentioning

confidence: 99%

Large emission enhancement and emergence of strong coupling with plasmons in nanoassemblies: Role of quantum interactions and finite emitter size

et al. 2019

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“…On the contrary, metal nanocomponents of different shapes have been used to increase the efficiency of light emission in semiconductor nanostructure devices. For more detail, see, e.g., [18][19][20] and the references therein. Also, the enhancement of Raman scattering has been known for some time and is frequently used in spectroscopy.…”

Section: Effect Of the Central Metal Wire On The Interaction With The Electric Fieldmentioning

confidence: 99%

“…This system of equations is solved in COMSOL with boundary conditions appropriate to the symmetry of η(r)u 0 (r) and the results are used in Equations ( 26) to obtain the polarizability components. The spectrum of absorbed power, P (ω), is easily deduced from the values obtained for α 2 (ω) by means of Equation (20).…”

Section: Polarizability and Absorption Spectrummentioning

confidence: 99%

“…This large value of the polarizability agrees with that of the corresponding oscillator strength, f 0 2,1 = 0.533, shown in the top graph of Figure 11. Figure 13 shows the product −α 2 (ω)hω which, according to Equation (20), is a measure, in arbitrary units, of the power absorbed from the electromagnetic field in the cell under consideration. The contribution from the transition to the n = 1, m = 1 state is strongly reduced in the power spectrum, due to the presence of the factor ω in the definition of P. The dominant transition now is that to the n = 2, m = 1 state at about 150 meV.…”

Section: Polarizability and Absorption Spectrummentioning

confidence: 99%

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Trapping of Electrons around Nanoscale Metallic Wires Embedded in a Semiconductor Medium

Huynh¹,

Evrard²,

Nguyen³

2021

Electronic Materials

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We predict that conduction electrons in a semiconductor film containing a centered square array of metal nanowires normal to its plane are bound in quantum states around the central wires, if a positive bias voltage is applied between the wires at the square vertices and the latter. We obtain and discuss the eigenenergies and eigenfunctions of two models with different dimensions. The results show that the eigenstates can be grouped into different shells. The energy differences between the shells is typically a few tens of meV, which corresponds to frequencies of emitted or absorbed photons in a range of 3THz to 20THz approximately. These energy differences strongly depend on the bias voltage. We calculate the linear response of individual electrons on the ground level of our models to large-wavelength electromagnetic waves whose electric field is in the plane of the semiconductor film. The computed oscillator strengths are dominated by the transitions to the states in each shell whose wave function has a single radial node line normal to the wave electric field. We include the effect of the image charge induced on the central metal wires and show that it modifies the oscillator strengths so that their sum deviates from the value given by the ThomasâReicheâKuhn rule. We report the linear response, or polarizability, versus photon energy, of the studied models and their absorption spectra. The latter show well-defined peaks as expected from the study of the oscillator strengths. We show that the position of these absorption peaks is strongly dependent on the bias voltage so that the frequency of photon absorption or emission in the systems described here is easily tunable. This makes them good candidates for the development of novel infrared devices.

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Position and Orientation dependent Hybridization and Energy transfer of Dipole Emitter around Plasmonic Homodimers

2023

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A dipole emitter (analogous to organic molecules) placed near any dielectric or metal nanoparticles, based on their spatially constrained location and orientation, vividly emulate optical nanoantennas. Herein, we have extensively simulated the single dipole emitter interaction with spherical homodimers of noble metal gold and silver nanoparticles for different positional dependent orientations, exemplifying systematically the hybridization (Rabi splitting), quenching and diffuse non‐radiative energy transfer effects. The blue‐shifted scattering spectra of the coupled dipole emitter with individual Ag and Au homodimers quantify and corroborate the corresponding quantum yield/efficiency estimations. Such spatially oriented emitter interaction further distinctly reveals the enhanced near‐field and far‐field effects of the plasmonic dimer system in terms of dipolar and quadrupolar resonances, arising due to the induced polarization by respective incident electric and opto‐magnetic field components. Understanding the surface‐enhanced behavior of organic molecules that are either incorporated or randomly attached (experimentally) on the surface of metal nanoparticles will benefit greatly from the present comprehensive data analysis.

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Strong Coupling of an Emitter with Absorbing Matter: A Regime for Enhancement of Light Emission

Cited by 7 publications

References 57 publications

Large emission enhancement and emergence of strong coupling with plasmons in nanoassemblies: Role of quantum interactions and finite emitter size

Large emission enhancement and emergence of strong coupling with plasmons in nanoassemblies: Role of quantum interactions and finite emitter size

Trapping of Electrons around Nanoscale Metallic Wires Embedded in a Semiconductor Medium

Position and Orientation dependent Hybridization and Energy transfer of Dipole Emitter around Plasmonic Homodimers

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