Diatom Pore Arrays' Periodicities and Symmetries in the Euclidean Plane: Nature Between Perfection and Imperfection

Ghobara, Mohamed; Tiffany, Mary Ann; Gordon, Richard; Reissig, Louisa

doi:10.1002/9781119488170.ch6

Cited by 4 publications

(5 citation statements)

References 31 publications

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“…The pore size and pore spacing in diatoms are usually addressed as the key parameters in considering the valves’ photonic crystal features. In many diatom valves, the pore diameter spans four orders of magnitude, from 3 to 2000 nm [ 12 , 14 , 17 , 35 ], and the pore spacing is in the same range, in many cases overlapping with the wavelength of visible light. The pore size and spacing of our three structurally distinct valves are comparable with λ exc .…”

Section: Discussionmentioning

confidence: 99%

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Tuning SERS Signal via Substrate Structuring: Valves of Different Diatom Species with Ultrathin Gold Coating

2023

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The discovered light modulation capabilities of diatom silicious valves make them an excellent toolkit for photonic devices and applications. In this work, a reproducible surface-enhanced Raman scattering (SERS) enhancement was achieved with hybrid substrates employing diatom silica valves coated with an ultrathin uniform gold film. Three structurally different hybrid substrates, based on the valves of three dissimilar diatom species, have been compared to elucidate the structural contribution to SERS enhancement. The comparative analysis of obtained results showed that substrates containing cylindrical Aulacoseira sp. valves achieved the highest enhancement, up to 14-fold. Numerical analysis based on the frequency domain finite element method was carried out to supplement the experimental results. Our results demonstrate that diatom valves of different shapes can enhance the SERS signal, offering a toolbox for SERS-based sensors, where the magnitude of the enhancement depends on valve geometry and ultrastructure.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Therefore, the periodic porosity of the valves is similar to PC slabs and could have features such as GMR for off-axis light propagation. Nevertheless, unlike artificial PC slabs, diatom valves are of finite size, with curved edges, and often with more complex symmetries [ 35 ].…”

Section: Discussionmentioning

confidence: 99%

Tuning SERS Signal via Substrate Structuring: Valves of Different Diatom Species with Ultrathin Gold Coating

2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The pore size and pore spacing in diatoms are usually addressed to be the key parameters in considering the valves' photonic crystal features. In many diatom valves, the pore diameter spans four orders of magnitude, from 3 -2000 nm [12,14,17,33], and the pore spacing is in the same range, in many cases overlapping with the wavelength of visible light. The pore size and spacing of our three structurally distinct valves are comparable with λexc.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Tuning SERS Signal via Substrate Structuring: Valves of Different Diatom Species with Ultrathin Gold Coating

Gilic¹,

Ghobara²,

Reissig³

2023

Preprint

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The discovered light modulation capabilities of diatom silicious valves make them an excellent toolkit for photonic devices and applications. In this work, a reproducible surface-enhanced Raman-scattering (SERS) enhancement was achieved with hybrid substrates employing diatom silica valves coated with an ultrathin uniform gold film. Three structurally different hybrid substrates, based on the valves of three dissimilar diatom species, have been compared to elucidate the structural contribution to SERS enhancement. The comparative analysis of obtained results showed that substrates containing cylindrical Aulacoseira sp. valves achieved the highest enhancement up to 14-fold. Numerical analysis based on the frequency domain finite element method was carried out to supplement the experimental results. Our results demonstrate that diatom valves of different shapes can enhance the SERS signal, offering a toolbox for SERS-based sensors, where the magnitude of the enhancement depends on valve geometry and ultrastructure.

show abstract

“…It is considered the most diverse microalgal class globally and exists in almost all aquatic ecosystems [ 12 ]. Diatoms exhibit a cell wall of amorphous hydrated silica (the so-called frustule) with species-specific pore patterning often of high regularity [ 11 , 13 ]. These frustules are synthesized and shaped through complex biomineralization processes occurring during the growth and reproduction of their living cells [ 9 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

et al. 2022

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Siliceous diatom frustules present a huge variety of shapes and nanometric pore patterns. A better understanding of the light modulation by these frustules is required to determine whether or not they might have photobiological roles besides their possible utilization as building blocks in photonic applications. In this study, we propose a novel approach for analyzing the near-field light modulation by small pennate diatom frustules, utilizing the frustule of Gomphonema parvulum as a model. Numerical analysis was carried out for the wave propagation across selected 2D cross-sections in a statistically representative 3D model for the valve based on the finite element frequency domain method. The influences of light wavelength (vacuum wavelengths from 300 to 800 nm) and refractive index changes, as well as structural parameters, on the light modulation were investigated and compared to theoretical predictions when possible. The results showed complex interference patterns resulting from the overlay of different optical phenomena, which can be explained by the presence of a few integrated optical components in the valve. Moreover, studies on the complete frustule in an aqueous medium allow the discussion of its possible photobiological relevance. Furthermore, our results may enable the simple screening of unstudied pennate frustules for photonic applications.

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Diatom Pore Arrays' Periodicities and Symmetries in the Euclidean Plane: Nature Between Perfection and Imperfection

Cited by 4 publications

References 31 publications

Tuning SERS Signal via Substrate Structuring: Valves of Different Diatom Species with Ultrathin Gold Coating

Tuning SERS Signal via Substrate Structuring: Valves of Different Diatom Species with Ultrathin Gold Coating

Tuning SERS Signal via Substrate Structuring: Valves of Different Diatom Species with Ultrathin Gold Coating

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

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