Perfect absorption in nanotextured thin films via Anderson-localized photon modes

Aeschlimann, Martin; Brixner, Tobias; Differt, Dominik; Heinzmann, Ulrich; Hensen, Matthias; Krämer, Christian; Lükermann, Florian; Melchior, Pascal; Pfeiffer, Walter; Piecuch, Martin; Schneider, Christian; Stiebig, Helmut; Strüber, Christian; Thielen, Philip

doi:10.1038/nphoton.2015.159

Cited by 51 publications

(38 citation statements)

References 37 publications

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“…Because the IPS is a universal property of molecular sheets [56], the ILB is derived from IPS by stacking them into a 3D solid [57]; screening is inefficient, and similar hot electron dynamics could occur in other quasi-2D materials with low densities of states at the Fermi level. Moreover, thermionic emission can occur in other materials and is likely to be the dominant process for photoemission from plasmonic nanoparticles where hot electron generation and light localization are particularly efficient [91][92][93].…”

Section: Discussionmentioning

confidence: 99%

Ultrafast Multiphoton Thermionic Photoemission from Graphite

et al. 2017

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Electronic heating of cold crystal lattices in nonlinear multiphoton excitation can transiently alter their physical and chemical properties. In metals where free electron densities are high and the relative fraction of photoexcited hot electrons is low, the effects are small, but in semimetals, where the free electron densities are low and the photoexcited densities can overwhelm them, the intense femtosecond laser excitation can induce profound changes. In semimetal graphite and its derivatives, strong optical absorption, weak screening of the Coulomb potential, and high cohesive energy enable extreme hot electron generation and thermalization to be realized under femtosecond laser excitation. We investigate the nonlinear interactions within a hot electron gas in graphite through multiphoton-induced thermionic emission. Unlike the conventional photoelectric effect, within about 25 fs, the memory of the excitation process, where resonant dipole transitions absorb up to eight quanta of light, is erased to produce statistical Boltzmann electron distributions with temperatures exceeding 5000 K; this ultrafast electronic heating causes thermionic emission to occur from the interlayer band of graphite. The nearly instantaneous thermalization of the photoexcited carriers through Coulomb scattering to extreme electronic temperatures characterized by separate electron and hole chemical potentials can enhance hot electron surface femtochemistry, photovoltaic energy conversion, and incandescence, and drive graphite-to-diamond electronic phase transition.

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Section: Discussionmentioning

confidence: 99%

Ultrafast Multiphoton Thermionic Photoemission from Graphite

et al. 2017

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“…Coherent backscattering can be seen on much smaller spatial scales too, such as when it is used to improve light absorption in solar cells 2 or when the effect enables lasing in disordered media such as plastic or powdered semiconductors 3,4 . Likewise, scattering in periodic structures leads to 'localized light' , which is made use of in photonic crystals, suggesting a way to control light transmission 5 .…”

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confidence: 99%

Using coherence to enhance function in chemical and biophysical systems

Scholes

Fleming

Chen

et al. 2017

Nature

572

550

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“…Because the regime of strong disorder not only confirms the connected 1D structure more thoroughly but also shows the broadband nature of disorder more evidently (Fig. 2h vs 2e, for the disorder-induced removal of bandgaps [8]), the broadband device based on disordered structures [1,[10][11][12][13]29] is a suitable application of our network-inspired design methodology. A higher-dimensional (2D,3D) structure with a disordered coupling network is the representative example of a high-degree random-walk network.…”

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confidence: 73%

“…Due to the critical needs in light harvesting [6], robust bandgaps [7,8], and ultrafast optics [9], disordered optical materials have also been intensively studied to exploit their broadband responses. Although one-(1D) [8,10], two-(2D) [1,11,12], and three-dimensional (3D) [13] disordered structures have been considered promising candidates for broadband and omnidirectional operations, the deliberate control of disordered structures [1,3,7,8,14] has been achieved only in 1D or 2D structures, owing to the difficulty of manipulating 3D randomness.To understand the role of the 'dimension' in optics, we can employ the interdisciplinary viewpoint from network theory. For the structures composed of coupled resonances, light flows inside those can be interpreted as signal transport over graph networks [14][15][16][17].…”

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confidence: 99%

Interdimensional optical isospectrality inspired by graph networks

Yu¹,

Piao²,

Hong³

et al. 2016

Optica

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A network picture has been applied to various physical and biological systems to understand their governing mechanisms intuitively. Utilizing discretization schemes, both electrical and optical materials can also be interpreted as abstract 'graph' networks composed of couplings (edges) between local elements (vertices), which define the correlation between material structures and wave flows. Nonetheless, the fertile structural degrees of freedom in graph theory have not been fully exploited in physics owing to the suppressed long-range interaction between far-off elements. Here, by exploiting the mathematical similarity between Hamiltonians in different dimensions, we propose the design of reduceddimensional optical structures that perfectly preserve the level statistics of disordered graph networks with significant long-range coupling. We show that the disorder-induced removal of the level degeneracy in high-degree networks allows their isospectral projection to one-dimensional structures without any disconnection. This inter-dimensional isospectrality between high-and low-degree graph-like structures enables the ultimate simplification of broadband multilevel devices, from three-to one-dimensional structures.Random scattering provides the spread of momentum and energy components of waves [1][2][3], differentiating disordered materials from periodic or quasiperiodic materials [4,5]. Due to the critical needs in light harvesting [6], robust bandgaps [7,8], and ultrafast optics [9], disordered optical materials have also been intensively studied to exploit their broadband responses. Although one-(1D) [8,10], two-(2D) [1,11,12], and three-dimensional (3D) [13] disordered structures have been considered promising candidates for broadband and omnidirectional operations, the deliberate control of disordered structures [1,3,7,8,14] has been achieved only in 1D or 2D structures, owing to the difficulty of manipulating 3D randomness.To understand the role of the 'dimension' in optics, we can employ the interdisciplinary viewpoint from network theory. For the structures composed of coupled resonances, light flows inside those can be interpreted as signal transport over graph networks [14][15][16][17]. Reciprocity constructs the undirected network [14,18], whose vertices and edges denote resonances and coupling, respectively. The strength of disorder then corresponds to the graph irregularity, and the dimension of material structures determines the 'degree' of graphs, which quantifies the number of coupling paths in space. This graphbased perspective reveals that optical structures in 3D real space cover only restricted parts of general graph theory [18], originating from the difficulty in connecting far-off vertices in real space. At most, nearestneighbor and next-nearest-neighbor coupling [19] have been considered in the light transport.Here, we focus on the real-space reproduction of the level statistics in hypothetical optical networks of arbitrary couplings, consequently deriving the 'isospectrality' between the stru...

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Perfect absorption in nanotextured thin films via Anderson-localized photon modes

Cited by 51 publications

References 37 publications

Ultrafast Multiphoton Thermionic Photoemission from Graphite

Ultrafast Multiphoton Thermionic Photoemission from Graphite

Using coherence to enhance function in chemical and biophysical systems

Interdimensional optical isospectrality inspired by graph networks

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