Disorder in Photonic Structures Induced by Random Layer Thickness

Chiasera, Alessandro; Scotognella, Francesco; Criante, Luigino; Varas, Stefano; Valle, Giuseppe Della; Ramponi, Roberta; Ferrari, Maurizio

doi:10.1166/sam.2015.2249

Cited by 46 publications

(28 citation statements)

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“…During the deposition process, the substrates were not heated and the temperature of the sample holder during the deposition was 30 C. The sputtering has occurred with an Ar gas pressure of 5.4 Â 10 À3 mbar; the applied rf power was 120 W and the reflected powers 0 W. The deposition time needed to obtain a planar waveguide that supports a mode at 1.5 mm was of 70 h. As prepared samples present a non-stoichiometry structure of SiOx with x < 2. To achieve the correct stoichiometry, the samples were subsequently treated in air at 400 C for 6 h [9].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

SiO 2 -P 2 O 5 -HfO 2 -Al 2 O 3 -Na 2 O glasses activated by Er 3+ ions: From bulk sample to planar waveguide fabricated by rf-sputtering

et al. 2017

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Section: Methodsmentioning

confidence: 99%

“…The absorption spectra in the VIS-NIR region of the bulk samples were obtained by using a double beam Varian-Cary spectrophotometer with a resolution of 2 nm [9].…”

Section: Methodsmentioning

confidence: 99%

SiO 2 -P 2 O 5 -HfO 2 -Al 2 O 3 -Na 2 O glasses activated by Er 3+ ions: From bulk sample to planar waveguide fabricated by rf-sputtering

et al. 2017

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“…For more details, see ref. 24 . All the simulations have been performed using the transfer matrix method, widely used to study the optical properties of layered photonic structures.…”

Section: Unit Cell (M Layers)mentioning

confidence: 99%

Optical properties of one-dimensional disordered multilayer photonic structures

Scotognella

Chiasera²,

Criante

et al. 2015

Oxide-Based Materials and Devices VI

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The investigation of the differences between ordered and disordered materials (in the hundreds of nanometer lengthscale) is a crucial topic for a better understanding of light transport in photonic media. Here we study the light transmission properties of 1D photonic structures in which disorder is introduced in two different ways. In the first study, we have grouped the high refractive index layers in layer clusters, randomly distributed among layers of low refractive index. We have controlled the maximum size of such clusters and the ratio of the high-low refractive index layers (here called dilution). We studied the total transmission of the disordered structure within the photonic band gap of the ordered structure as a function of the maximum cluster size, and we have observed a valley in trend of the total transmission for a specific maximum cluster size. This value increases with increasing dilution. Furthermore, within one dilution we observe oscillations of the total transmission with increasing cluster size. In the second study, we have realized photonic structures with a random variation of the layer thickness. The structures were fabricated by radio-frequency (RF) sputtering technique. The transmission spectrum of the disordered structure was simulated by taking into account the refractive index dispersion of the materials, resulting in a good agreement between the experimental data and the simulations. We found that the transmission of the photonic structure in the range 300-1200 nm is lower with respect the corresponding periodic photonic crystal. The studied disordered 1D photonic structures are very interesting for the modelization and realization of broad band filters and light harvesting devices.

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“…In these materials, light is not allowed to propagate for certain photon energies, in correspondence with the so-called photonic band gap [10][11][12][13]. One-dimensional multilayer photonic crystals can be fabricated with many fabrication techniques such as sputtering, spin coating, pulsed laser deposition, chemical etching, and molecular beam epitaxy [14][15][16][17][18]. These structures are useful for several applications, for example lasing [15,19], emission control [20][21][22], and sensing [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Tantalum Arsenide-Based One-Dimensional Photonic Structures

2018

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Weyl semimetals can be described as the three-dimensional analogue of graphene, showing linear dispersion around nodes (Weyl points). Tantalum arsenide is among the most studied Weyl semimetals. It has been demonstrated that TaAs has a very high value of the real part of the complex refractive index in the infrared region. In this work we show one-dimensional photonic crystals alternating TaAs with SiO 2 or TiO 2 and a microcavity where a layer of TaAs is embedded between two SiO 2 -TiO 2 multilayers.

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Disorder in Photonic Structures Induced by Random Layer Thickness

Cited by 46 publications

References 0 publications

SiO 2 -P 2 O 5 -HfO 2 -Al 2 O 3 -Na 2 O glasses activated by Er 3+ ions: From bulk sample to planar waveguide fabricated by rf-sputtering

SiO 2 -P 2 O 5 -HfO 2 -Al 2 O 3 -Na 2 O glasses activated by Er 3+ ions: From bulk sample to planar waveguide fabricated by rf-sputtering

Optical properties of one-dimensional disordered multilayer photonic structures

Tantalum Arsenide-Based One-Dimensional Photonic Structures

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