Porous Silicon Photonic Crystals

Estevez, J. O.; Agarwal, Vivechana

doi:10.1007/978-3-319-04508-5_82-1

Cited by 4 publications

(5 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Porous Si one-dimensional (1D) multilayered structures can be designed and fabricated by a nonperiodical manner, according to an algorithm determining the sequences and thickness of high and low porosity layers [ 62 ]. Most of these structures (e.g., Cantor and Thue-Morse) are also referred to as 1D fractal photonic crystals since their morphology is based on the self-similarity principle.…”

Section: New Structures and Approachesmentioning

confidence: 99%

“…The PSi two–dimensional (2D) photonic crystals were intensively investigated for the past decade mostly for biosensing in aqueous medium [ 62 , 68 , 69 ], whereas their applicability for gas detection was very limited, with the exception of the IR absorption spectroscopy [ 70 , 71 ]. However, gas sensing with 2D and 3D photonic crystals prepared from other materials has been sufficiently reported in literature (see recent review [ 72 ] and references therein).…”

Section: New Structures and Approachesmentioning

confidence: 99%

See 1 more Smart Citation

Porous Silicon Structures as Optical Gas Sensors

Levitsky

2015

Sensors

113

View full text Add to dashboard Cite

We present a short review of recent progress in the field of optical gas sensors based on porous silicon (PSi) and PSi composites, which are separate from PSi optochemical and biological sensors for a liquid medium. Different periodical and nonperiodical PSi photonic structures (bares, modified by functional groups or infiltrated with sensory polymers) are described for gas sensing with an emphasis on the device specificity, sensitivity and stability to the environment. Special attention is paid to multiparametric sensing and sensor array platforms as effective trends for the improvement of analyte classification and quantification. Mechanisms of gas physical and chemical sorption inside PSi mesopores and pores of PSi functional composites are discussed.

show abstract

Section: New Structures and Approachesmentioning

confidence: 99%

Section: New Structures and Approachesmentioning

confidence: 99%

Porous Silicon Structures as Optical Gas Sensors

Levitsky

2015

Sensors

113

View full text Add to dashboard Cite

show abstract

“…Porous silicon (pSi)-based photonic crystals produced by electrochemical etching of silicon are outstanding examples of that and have been extensively used in many research fields and applications due to their superior optoelectronic properties . The porosity of porous silicon can be engineered in depth by alternating the current density applied during the electrochemical etching process, which is typically performed in hydrofluoric acid (HF)-based electrolytes. − The relationship between the porosity of pSi and its effective refractive index makes it achievable to tune the photonic stop band of pSi through its porosity. This enables a precise and versatile means for engineering the interaction between light and matter in the form of a broad range of photonic nanostructures such as microcavities, distributed Bragg reflectors, waveguides, omnidirectional mirrors and rugate filters. − Despite the numerous advantages of pSi-based photonic structures, this material presents some inherent limitations such as poor chemical stability and weak mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Structural Engineering of Nanoporous Anodic Alumina Photonic Crystals by Sawtooth-like Pulse Anodization

Law

Santos

Nemati

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

This study presents a sawtooth-like pulse anodization approach aiming to create a new type of photonic crystal structure based on nanoporous anodic alumina. This nanofabrication approach enables the engineering of the effective medium of nanoporous anodic alumina in a sawtooth-like manner with precision. The manipulation of various anodization parameters such as anodization period, anodization amplitude, number of anodization pulses, ramp ratio and pore widening time allows a precise control and fine-tuning of the optical properties (i.e., characteristic transmission peaks and interferometric colors) exhibited by nanoporous anodic alumina photonic crystals (NAA-PCs). The effect of these anodization parameters on the photonic properties of NAA-PCs is systematically evaluated for the establishment of a fabrication methodology toward NAA-PCs with tunable optical properties. The effective medium of the resulting NAA-PCs is demonstrated to be optimal for the development of optical sensing platforms in combination with reflectometric interference spectroscopy (RIfS). This application is demonstrated by monitoring in real-time the formation of monolayers of thiol molecules (11-mercaptoundecanoic acid) on the surface of gold-coated NAA-PCs. The obtained results reveal that the adsorption mechanism between thiol molecules and gold-coated NAA-PCs follows a Langmuir isotherm model, indicating a monolayer sorption mechanism.

show abstract

“…Recently, porous silicon has been applied in the biomedical research field, by generating porous silicon microparticles (pSiMPs) and nanoparticles (pSiNPs) [14,15,16,17,18,19,20,21,22,23]. The discovery of the quantum confinement effect and biodegradable property brings porous silicon into the spotlight [14,24,25,26,27]. In particular, pSiNPs display many advantages, including (i) high load efficiency toward substrates, such as drugs and peptides, (ii) superior controlled-release properties, (iii) no harmful byproduct generation after degradation, (iv) strong near-infrared (NIR) photoluminescence and two-photon (TP) absorbing ability for bio-imaging, (v) negligible cytotoxicity, and (vi) cell/organ/bacteria specific targeting abilities through fabrication of the surface.…”

Section: Introductionmentioning

confidence: 99%

Systematic Degradation Rate Analysis of Surface-Functionalized Porous Silicon Nanoparticles

et al. 2019

View full text Add to dashboard Cite

Porous silicon nanoparticles (pSiNPs) have been utilized within a wide spectrum of biological studies, as well as in chemistry, chemical biology, and biomedical fields. Recently, pSiNPs have been constantly coming under the spotlight, mostly in biomedical applications, due to their advantages, such as controlled-release drug delivery in vivo by hydrolysis-induced degradation, self-reporting property through long life-time photoluminescence, high loading efficiency of substrate into pore, and the homing to specific cells/organ/bacteria by surface functionalization. However, the systematic degradation rate analysis of surface-functionalized pSiNPs in different biological media has not been conducted yet. In this paper, we prepared four different surface-functionalized pSiNPs samples and analyzed the degradation rate in six different media (DI H2O (deionized water), PBS (phosphate-buffered saline), HS (human serum), DMEM (Dulbecco’s modified Eagle’s medium), LB (lysogeny broth), and BHI (brain heart infusion)). The obtained results will now contribute to understanding the correlation between surface functionalization in the pSiNPs and the degradation rate in different biological media. The characterized data with the author’s suggestions will provide useful insights in designing the new pSiNPs formulation for biomedical applications.

show abstract

Porous Silicon Photonic Crystals

Cited by 4 publications

References 56 publications

Porous Silicon Structures as Optical Gas Sensors

Porous Silicon Structures as Optical Gas Sensors

Structural Engineering of Nanoporous Anodic Alumina Photonic Crystals by Sawtooth-like Pulse Anodization

Systematic Degradation Rate Analysis of Surface-Functionalized Porous Silicon Nanoparticles

Contact Info

Product

Resources

About