Journal ArticleDOI
Vapor sensing using the optical properties of porous silicon Bragg mirrors
TLDR
In this article, large wavelength shifts have been measured in the reflectivity spectra of Bragg mirrors etched in porous silicon after exposure of the mirrors to vapor from organic solvents.Abstract:
Large wavelength shifts have been measured in the reflectivity spectra of Bragg mirrors etched in porous silicon after exposure of the mirrors to vapor from organic solvents. The shift in the Bragg wavelength of the mirror arises from refractive index changes, induced by capillary condensation of the vapor in the mesoporous silicon, in the layers of the mirrors. Modeling of the reflectivity changes shows that the layer liquid volume fraction occurring in the measurements was 0.29 for acetone and 0.33 for chlorobenzene. Time-resolved measurements show that condensation occurs on the time scale of tens of seconds.read more
Citations
More filters
Journal ArticleDOI
Responsive photonic crystals.
Jianping Ge,Yadong Yin +1 more
TL;DR: This Review summarizes recent developments in the field of responsive photonic crystal structures, including principles for design and fabrication and many strategies for applications, for example as optical switches or chemical and biological sensors.
Journal ArticleDOI
Porous silicon in drug delivery devices and materials
TL;DR: The optical properties of photonic structures prepared from porous Si or SiO2 hosts provide a self-reporting feature that can be monitored in vivo.
Journal ArticleDOI
Morpho butterfly wing scales demonstrate highly selective vapour response
Radislav A. Potyrailo,Helen Ghiradella,A. Vertiatchikh,Katharine Dovidenko,James R. Cournoyer,Eric R Olson +5 more
TL;DR: In this article, the authors show that the iridescent scales of the Morpho sulkowskyi butterfly give a different optical response to different individual vapours, and that this optical response dramatically outperforms that of existing nano-engineered photonic sensors.
Journal ArticleDOI
Biomolecular screening with encoded porous-silicon photonic crystals
Frédérique Cunin,Thomas A. Schmedake,Jamie R. Link,Yang Yang Li,Jennifer Koh,Sangeeta N. Bhatia,Michael J. Sailor +6 more
TL;DR: A method for optically encoding micrometre-sized nanostructured particles of porous silicon using a periodic electrochemical etch and a simple antibody-based bioassay using fluorescently tagged proteins demonstrates the encoding strategy in biologically relevant media.
Journal ArticleDOI
Polymer replicas of photonic porous silicon for sensing and drug delivery applications.
Yang Yang Li,Frédérique Cunin,Jamie R. Link,Ting Gao,Ronald E. Betts,Sarah H. Reiver,Vicki I. Chin,Sangeeta N. Bhatia,Michael J. Sailor +8 more
TL;DR: In this paper, a variety of organic and biopolymers are constructed from one-dimensional photonic crystals, which can be dissolved or melted, by templating the solution-cast or injection-molded materials in porous silicon or porous silicon dioxide multilayer structures.
References
More filters
Book
Absorption and Scattering of Light by Small Particles
TL;DR: In this paper, a Potpourri of Particles is used to describe surface modes in small Particles and the Angular Dependence of Scattering is shown to be a function of the size of the particles.
Journal ArticleDOI
The structural and luminescence properties of porous silicon
TL;DR: A large amount of work world wide has been directed towards obtaining an understanding of the fundamental characteristics of porous Si as mentioned in this paper, and the key importance of crystalline Si nanostructures in determining the behaviour of porous si is highlighted.
Journal ArticleDOI
A Porous Silicon-Based Optical Interferometric Biosensor
Victor Lin,Kianoush Motesharei,Kianoush Motesharei,Keiki-Pua S. Dancil,Keiki-Pua S. Dancil,Michael J. Sailor,Michael J. Sailor,M. Reza Ghadiri,M. Reza Ghadiri +8 more
TL;DR: A biosensor has been developed based on induced wavelength shifts in the Fabry-Perot fringes in the visible-light reflection spectrum of appropriately derivatized thin films of porous silicon semiconductors based on Binding of molecules induced changes in the refractive index of the porous silicon.
Journal ArticleDOI
Optical properties of porous silicon superlattices
TL;DR: In this paper, the authors demonstrate that porous silicon superlattices act like a multilayer dielectric device, and demonstrate that they can be used to measure reflectance measurements in the infrared and visible range.
Book ChapterDOI
Confined Electrons and Photons
TL;DR: The scientific fields of confined electrons and photons have become areas of major efforts worldwide as mentioned in this paper and their appeal originates in the many facets they offer in fundamental and applied science, in technology and device development, and to high technology, large-scale industries.