Energy equipartition and unidirectional emission in a spaser nanolaser

Gongora, Juan Sebastian Totero; Miroshnichenko, Andrey E.; Kivshar, Yuri S.; Fratalocchi, Andrea

doi:10.1002/lpor.201500239

Cited by 30 publications

(18 citation statements)

References 57 publications

(98 reference statements)

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“…Such important difference opens to the realistic study of a large number of complex systems, such as chaotic or irregular shaped resonators and disordered many-body cavities. Moreover, as discussed in [38], the Fano-Feshbach approach can be easily extended to include complex light-matter interaction phenomena occurring in the interior of the resonator, such as stimulated emission of radiation or nonlinear material responses. Such possibility allows for a rigorous modeling of mode competition phenomena in non-conventional nanolasers characterized by strongly coupled multi-mode regimes.…”

Section: Theoretical Methodsmentioning

confidence: 99%

Fundamental and high-order anapoles in all-dielectric metamaterials via Fano–Feshbach modes competition

2017

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Abstract. One of the most fascinating possibilities enabled by metamaterials is the strong reduction of the electromagnetic scattering from nanostructures. In dielectric nanoparticles, the formation of a minimal scattering state at specific wavelengths, is associated with the excitation of photonic anapoles, which represent a peculiar type of radiationless state and whose existence has been demonstrated experimentally. In this work, we investigate the formation of anapole states in generic dielectric structures by applying a Fano-Feshbach projection scheme, a general technique widely used in the study of quantum mechanical open systems. By expressing the total scattering from the structure in terms of an orthogonal set of internal and external modes, defined in the interior and in the exterior of the dielectric structure, respectively, we show how anapole states are the result of a complex interaction among the resonances of the system and the surrounding environment. We apply our approach to a circular resonator, where we observe the formation of higher-order anapole states, which are originated by the superposition of several internal resonances of the system.

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Section: Theoretical Methodsmentioning

confidence: 99%

Fundamental and high-order anapoles in all-dielectric metamaterials via Fano–Feshbach modes competition

2017

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“…We performed fully-dispersive three-dimensional FDTD simulations using our home-made simulator NANOCPP [24][25][26][27][28][29]. In our simulations, the computational domain was organized as follows: the z-aligned nanodisks were placed at the centre of a 2 µm × 2 µm × 1 µm box, with uniaxial perfectly matched layer (UPML) boundary conditions emulating an open system [30].…”

Section: Fdtd Simulationsmentioning

confidence: 99%

Near-Field Coupling and Mode Competition in Multiple Anapole Systems

2017

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All-dielectric metamaterials are a promising platform for the development of integrated photonics applications. In this work, we investigate the mutual coupling and interaction of an ensemble of anapole states in silicon nanoparticles. Anapoles are intriguing non-radiating states originated by the superposition of internal multipole components which cancel each other in the far-field. While the properties of anapole states in single nanoparticles have been extensively studied, the mutual interaction and coupling of several anapole states have not been characterized. By combining first-principles simulations and analytical results, we demonstrate the transferring of anapole states across an ensemble of nanoparticles, opening to the development of advanced integrated devices and robust waveguides relying on non-radiating modes.

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“…Additionally, this device could harvest light on both sides to efficiently gain and store the energy to keep the photocatalytic reaction active. Parallel FDTD simulations are carried out by our dispersive FDTD code NANOCPP [4]- [5]. Starting from an existing device, we considered two different types of interfaces: water/Si/Pt interface and water/SiN x /Al 2 O 3 /Si.…”

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confidence: 99%

High performance nanostructured Silicon heterojunction for water splitting on large scales

Bonifazi

et al. 2017

2017 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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In past years the global demand for energy has been increasing steeply, as well as the awareness that new sources of clean energy are essential. Photo-electrochemical devices (PEC) for water splitting applications have stirred great interest, and different approach has been explored to improve the efficiency of these devices and to avoid optical losses at the interfaces with water. These include engineering materials and nanostructuring the device's surfaces [1]- [2]. Despite the promising initial results, there are still many drawbacks that needs to be overcome to reach large scale production with optimized performances [3]. We present a new device that relies on the optimization of the nanostructuring process that exploits suitably disordered surfaces. Additionally, this device could harvest light on both sides to efficiently gain and store the energy to keep the photocatalytic reaction active. Optimized geometrical parameters for these surfaces are computed in order to obtain very high broadband absorbance without generating trapping state for light or carriers, thus remarkably reducing optical losses. We then realize a new device exploiting the results of our theoretical investigation. Figure 1 a-b show SEM images of the fabricated sample. Figure 1 c presents the J-E characteristic of the Si-photoelectrode under two different illumination intensities, used to provide an electrochemical characterization of the performances of the device. Once the device is illuminated, we measured a current of 60 mAcm −2 with bias voltages V near zero. This technique could pave the way to the development of a new generation of high performance, eco-friendly and cost effective water splitting PEC devices. References[1] Ding, Q., et al.," Designing efficient solar driven hydrogen evolution photocathodes using semitransparent MoQ x Cl y (Q = S, Se) catalysts on Si micropyramids ", Adv. Mater. 14, 1245Mater. 14, -1251Mater. 14, (2015 [2] Koynov, S.,et al., " Black non reflective silicon surfaces for solar cells", et al., Applied Physics Letters 88, 203107 (2006) [ 978-1-5090-6736-7/17/$31.00 c 2017 IEEE

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Energy equipartition and unidirectional emission in a spaser nanolaser

Cited by 30 publications

References 57 publications

Fundamental and high-order anapoles in all-dielectric metamaterials via Fano–Feshbach modes competition

Fundamental and high-order anapoles in all-dielectric metamaterials via Fano–Feshbach modes competition

Near-Field Coupling and Mode Competition in Multiple Anapole Systems

High performance nanostructured Silicon heterojunction for water splitting on large scales

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