Spatial steadiness of individual disorder modes upon controlled spectral tuning

Caselli, Niccolò; Riboli, Francesco; Intonti, Francesca; China, Federico La; Biccari, Francesco; Gerardino, Annamaria; Gurioli, Massimo

doi:10.1063/1.4946852

Cited by 5 publications

(4 citation statements)

References 33 publications

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“…Therefore, even though the sample is not fully random, hereafter we will use the denomination random system/random modes both to stress the maximum practical randomness of our realization and to distinguish our sample from disordered media with higher spatial correlation [23]. This system has previously demonstrated to support localized modes in the telecom wavelength range, which is relevant for photonic applications [15,24]. We use the emission of embedded quantum dots (QDs) to pump the randomly generated modes.…”

Section: Resultsmentioning

confidence: 99%

Near-field speckle imaging of light localization in disordered photonic systems

Caselli

Intonti

China

et al. 2017

Applied Physics Letters

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ABSTRACT:Optical localization in strongly disordered photonic media is an attractive topic for proposing novel cavity like structures. Light interference can produce random modes confined within small volumes, whose spatial distribution in the near field is predicted to show hot spots at the nanoscale. However, these near field speckles have not yet been experimentally investigated, due to the lack of a high spatial resolution imaging techniques. Here, we study a system where the disorder is induced by random drilling air holes in a GaAs suspended membrane with internal InAs quantum dots. We perform deep subwavelength near field experiments in the telecom window to directly image the spatial distribution of the electric field intensity of disordered induced localized optical modes. We retrieve near field speckle patterns that extend over few micrometers and show several single speckles of the order of /10 size. The results are compared with numerical calculations and with recent findings in the literature of disordered media. Notably, the hot spots of random modes are found in proximity of the air holes of the disordered system.

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Section: Resultsmentioning

confidence: 99%

Near-field speckle imaging of light localization in disordered photonic systems

Caselli

Intonti

China

et al. 2017

Applied Physics Letters

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“…Beyond fundamental understanding of natural phenomena, the interest in this peculiar class of correlated disorder springs from the potential applications it may have in anomalous light and matter transport. Generally speaking, disordered materials are less prone to fabrication imperfections with respect to the ordered counterparts while displaying spatial steadiness of the photonic modes 11 . As such, if obtained via self-assembly over large scales, they may be much less expensive.…”

Section: Introductionmentioning

confidence: 99%

“…Generally speaking, disordered materials are less prone to fabrication imperfections with respect to the ordered counterparts while displaying spatial steadiness of the photonic modes. 11 As such, if obtained via self-assembly over large scales, they may be much less-expensive. In optics (e.g., for antireflection coatings), another advantage of disordered structures with respect to ordered arrays of objects (e.g., such as moth-eye structures for antireflection coatings) is the lack of diffraction from which neat colorization and angular dependencies can spring.…”

Section: ■ Introductionmentioning

confidence: 99%

Scalable Disordered Hyperuniform Architectures via Nanoimprint Lithography of Metal Oxides

Chehadi

Bouabdellaoui

Modaresialam

et al. 2021

ACS Appl. Mater. Interfaces

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Fabrication and scaling of disordered hyperuniform materials remain hampered by the difficulties in controlling the spontaneous phenomena leading to this novel kind of exotic arrangement of objects. Here we demonstrate a hybrid top-down/bottom-up approach based on sol-gel dip-coating and nano-imprint lithography for the faithful reproduction of disordered hyperuniform metasurfaces in metal oxides. Nano-to micro-structures made of silica and titania can be directly printed over several cm 2 on glass and on silicon substrates. First, we describe the polymer mold fabrication starting from a hard master obtained via spontaneous solid-state dewetting of SiGe and Ge thin layers on SiO2. Then we assess the effective disordered hyperuniform character of master and replica and the role of the thickness of the sol-gel layer on the metal oxide replicas and on the presence of a residual layer underneath. Finally, as a potential application, we show the antireflective character of titania structures on silicon. Our results are relevant for the realistic implementation over large scales of disordered hyperuniform nano-and micro-architectures made of metal oxides thus opening their exploitation in the framework of wet chemical assembly.

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“…In particular, a spectral tuning method that preserves all the other features of the mode is required to control the exciton–photon coupling. Recently, a first step in this direction has been demonstrated by performing nano‐oxidation of the dielectric membrane that hosts the disordered medium, in order to achieve few nm blue spectral shift of an individual random mode . Still this approach is not reversible, it induces a mode shift only to shorter wavelengths, it cannot be used on a large scale, and eventually it can produce intrinsic ( Q reduction) and extrinsic (emitters quenching) optical degradation of the sample.…”

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confidence: 99%

Mechanical and Electric Control of Photonic Modes in Random Dielectrics

et al. 2019

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Random dielectrics defines a class of non‐absorbing materials where the index of refraction is randomly arranged in space. Whenever the transport mean free path is sufficiently small, light can be confined in modes with very small volume. Random photonic modes have been investigated for their basic physical insights, such as Anderson localization, and recently several applications have been envisioned in the field of renewable energies, telecommunications, and quantum electrodynamics. An advantage for optoelectronics and quantum source integration offered by random systems is their high density of photonic modes, which span a large range of spectral resonances and spatial distributions, thus increasing the probability to match randomly distributed emitters. Conversely, the main disadvantage is the lack of deterministic engineering of one or more of the many random photonic modes achieved. This issue is solved by demonstrating the capability to electrically and mechanically control the random modes at telecom wavelengths in a 2D double membrane system. Very large and reversible mode tuning (up to 50 nm), both toward shorter or longer wavelength, is obtained for random modes with modal volumes of the order of few tens of (λ/n)3.

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Spatial steadiness of individual disorder modes upon controlled spectral tuning

Cited by 5 publications

References 33 publications

Near-field speckle imaging of light localization in disordered photonic systems

Near-field speckle imaging of light localization in disordered photonic systems

Scalable Disordered Hyperuniform Architectures via Nanoimprint Lithography of Metal Oxides

Mechanical and Electric Control of Photonic Modes in Random Dielectrics

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