scholarly journals Design, fabrication, and optical characterization of one-dimensional photonic crystals based on porous silicon assisted by in-situ photoacoustics

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Cristian Felipe Ramirez-Gutierrez ◽  
Harol David Martinez-Hernandez ◽  
Ivan Alonso Lujan-Cabrera ◽  
Mario Enrique Rodriguez-García
Keyword(s):  
Porous Silicon ◽  
Photonic Crystals ◽  
Electrochemical Etching ◽  
Visible Range ◽  
Fundamental Parameter ◽  
Carrier Distribution ◽  
One Dimensional ◽  
Porous Layers ◽  
Effective Media

Abstract We present a methodology to fabricate one-dimensional porous silicon (PSi) photonic crystals in the visible range by controlled etching and monitored by photoacoustics. Photoacoustic can record in-situ information about changes in the optical path and chemical reaction as well as in temperature, refractive index, and roughness during porous layers formation. Radiometry imaging can determine the carrier distribution of c-Si substrate that is a fundamental parameter to obtain high-quality PSi films. An electrochemical cell was calibrated through a series of single PSi layers that allows knowing the PA amplitude period, porosity, and roughness as a function of the current density. Optical properties of single layers were determined using the reflectance response in the UV-Vis range to solve the inverse problem through genetic algorithms. PhC structures were designed using the transfer matrix method and effective media approximation.Based on the growth kinetics of PSi single layers, those structures were fabricated by electrochemical etching monitored and controlled by in-situ photoacoustics.

scholarly journals Porous Silicon Biosensor for the Detection of Bacteria through Their Lysate

Biosensors ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 27
Author(s):  
Roselien Vercauteren ◽  
Audrey Leprince ◽  
Jacques Mahillon ◽  
Laurent A. Francis
Keyword(s):  
Porous Silicon ◽  
Electrochemical Etching ◽  
Bacterial Lysate ◽  
Fast Detection ◽  
Porous Layers ◽  
Deep Blue ◽  
Diffusion Limited ◽  
Colony Forming Units ◽  
Selective Lysis ◽  
Microfabrication Techniques

Porous silicon (PSi) has been widely used as a biosensor in recent years due to its large surface area and its optical properties. Most PSi biosensors consist in close-ended porous layers, and, because of the diffusion-limited infiltration of the analyte, they lack sensitivity and speed of response. In order to overcome these shortcomings, PSi membranes (PSiMs) have been fabricated using electrochemical etching and standard microfabrication techniques. In this work, PSiMs have been used for the optical detection of Bacillus cereus lysate. Before detection, the bacteria are selectively lysed by PlyB221, an endolysin encoded by the bacteriophage Deep-Blue targeting B. cereus. The detection relies on the infiltration of bacterial lysate inside the membrane, which induces a shift of the effective optical thickness. The biosensor was able to detect a B. cereus bacterial lysate, with an initial bacteria concentration of 105 colony forming units per mL (CFU/mL), in only 1 h. This proof-of-concept also illustrates the specificity of the lysis before detection. Not only does this detection platform enable the fast detection of bacteria, but the same technique can be extended to other bacteria using selective lysis, as demonstrated by the detection of Staphylococcus epidermidis, selectively lysed by lysostaphin.

Effects of the interface roughness in the optical response of one-dimensional photonic crystals of porous silicon

2019 ◽  
Vol 560 ◽  
pp. 133-139 ◽  
Author(s):  
I.A. Lujan-Cabrera ◽  
C.F. Ramirez-Gutierrez ◽  
J.D. Castaño-Yepes ◽  
M.E. Rodriguez-Garcia
Keyword(s):  
Porous Silicon ◽  
Photonic Crystals ◽  
Optical Response ◽  
Interface Roughness ◽  
One Dimensional

Planar polar liquid crystalline alignment in nanostructured porous silicon one-dimensional photonic crystals

2010 ◽  
Vol 97 (11) ◽  
pp. 113106 ◽  
Author(s):  
Shahar Mor ◽  
Vicente Torres-Costa ◽  
Raúl J. Martín-Palma ◽  
I. Abdulhalim
Keyword(s):  
Porous Silicon ◽  
Photonic Crystals ◽  
Liquid Crystalline ◽  
Polar Liquid ◽  
One Dimensional

Porous Silicon Morphology: Photo-Electrochemically Etched by Different Laser Wavelengths

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Shereen M. Faraj ◽  
Shaimaa M. Abd Al-Baqi ◽  
Nasreen R. Jber ◽  
Johnny Fisher
Keyword(s):  
Porous Silicon ◽  
Electrochemical Etching ◽  
Diode Lasers ◽  
Focus Of Attention ◽  
Blue Laser ◽  
Uniform Structure ◽  
Porous Layers ◽  
Current Densities ◽  
P Type ◽  
532 Nm

Porous silicon (PS) has become the focus of attention in upgrading silicon for optoelectronics. In this work, various structures were produced depending on the formation parameters by photo-electrochemical etching (PECE) process of n- and p-type silicon wafer at different time durations (5–90 mins) and different current densities (5, 15, and 20 mA/cm2) for each set of time durations. Diode lasers of 405 nm, 473 nm, and 532 nm wavelengths, each 50 mW power, were used to illuminate the surface of the samples during the etching process. The results showed that controlled porous layers were achieved by using blue laser, giving uniform structure which can make it possible to dispense with expensive methods of patterning the silicon.

Reflectivity of 1D photonic crystals: A comparison of computational schemes with experimental results

2018 ◽  
Vol 32 (11) ◽  
pp. 1850136 ◽  
Author(s):  
J. S. Pérez-Huerta ◽  
D. Ariza-Flores ◽  
R. Castro-García ◽  
W. L. Mochán ◽  
G. P. Ortiz ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Photonic Crystals ◽  
Spectral Line ◽  
Multilayer Structures ◽  
One Dimensional ◽  
Line Shapes ◽  
Number Of Layers ◽  
Reflectivity Spectra ◽  
Bloch Modes ◽  
Good Agreement

We report the reflectivity of one-dimensional finite and semi-infinite photonic crystals, computed through the coupling to Bloch modes (BM) and through a transfer matrix method (TMM), and their comparison to the experimental spectral line shapes of porous silicon (PS) multilayer structures. Both methods reproduce a forbidden photonic bandgap (PBG), but slowly-converging oscillations are observed in the TMM as the number of layers increases to infinity, while a smooth converged behavior is presented with BM. The experimental reflectivity spectra is in good agreement with the TMM results for multilayer structures with a small number of periods. However, for structures with large amount of periods, the measured spectral line shapes exhibit better agreement with the smooth behavior predicted by BM.

scholarly journals Porous Silicon Biosensor for the Detection of Bacteria through Their Lysate

Proceedings ◽  
2020 ◽  
Vol 60 (1) ◽  
pp. 36
Author(s):  
Roselien Vercauteren ◽  
Audrey Leprince ◽  
Jacques Mahillon ◽  
Laurent A. Francis
Keyword(s):  
Porous Silicon ◽  
Electrochemical Etching ◽  
Bacterial Lysate ◽  
Fast Detection ◽  
Porous Layers ◽  
Deep Blue ◽  
Diffusion Limited ◽  
Colony Forming Units ◽  
Selective Lysis ◽  
Microfabrication Techniques

Porous silicon (PSi) has been widely used as a biosensor over the last years due to its large surface area and its optical properties. Most PSi biosensors consist in close-ended porous layers, and, because of the diffusion-limited infiltration of the analyte, they lack sensitivity and speed of response. In order to overcome these shortcomings, PSi membranes (PSiMs) have been fabricated using electrochemical etching and standard microfabrication techniques. In this work, PSiMs have been used for the optical detection of Bacillus cereus lysate. Before detection, the bacteria are selectively lysed by PlyB221, an endolysin encoded by the bacteriophage Deep-Blue targeting B. cereus. The detection relies on the infiltration of bacterial lysate inside the membrane, which induces a shift of the effective optical thickness. The biosensor was able to detect a B. cereus bacterial lysate, with an initial bacteria concentration of 106 colony forming units per mL (CFU/mL), in less than 10 min. This work also demonstrates the selectivity of the lysis before detection. Not only does this detection platform enable the fast detection of bacteria, but the same technique can be extended to other bacteria using selective lysis.

One-dimensional porous silicon photonic crystals for visible and NIR applications

2005 ◽  
Vol 2 (9) ◽  
pp. 3466-3470 ◽  
Author(s):  
E. Xifré Pérez ◽  
T. Trifonov ◽  
J. Pallarès ◽  
L. F. Marsal
Keyword(s):  
Porous Silicon ◽  
Photonic Crystals ◽  
One Dimensional ◽  
Silicon Photonic

scholarly journals Seeded Porous Silicon Preparation as a Substrate in the Growth of ZnO Nanostructures

2015 ◽  
Vol 773-774 ◽  
pp. 626-631
Author(s):  
Kevin Alvin Eswar ◽  
Ajis Lepit ◽  
Rosfayanti Rasmidi ◽  
F.S. Husairi ◽  
A.N. Afaah ◽  
...  
Keyword(s):  
Thin Films ◽  
Porous Silicon ◽  
Annealing Temperature ◽  
Electrochemical Etching ◽  
Zno Thin Films ◽  
Visible Range ◽  
Zno Nanostructures ◽  
Post Annealing ◽  
Post Annealing Temperature ◽  
Uv Range

In this work, seeded porous silicon (PSi) was used as a substrate in the growth of ZnO nanostructures. PSi was prepared by electrochemical etching method. ZnO thin films as seeded were deposited via sol-gel spin coating method. ZnO nanostructures were grown on seeded PSi using hydrothermal immersion method. In order to study the effect of post-heat treatment on the substrate, post annealing temperature were varied in the range of 300 to 700 °C. The FESEM results shows ZnO thin film composed of nanoparticles were distributed over the PSi surface. Based on AFM characterization, the smoothest surface was produced at post annealing temperature of 500 °C. There are two different peaks appeared in PL characterization. The peak in near-UV range is belonging to ZnO thin films while a broad peak in visible range can be attributed to ZnO defects and PSi surface. In addition, FESEM, XRD and PL were used to characterize the ZnO nanostructures. The FESEM results revealed ZnO nano-flower were successfully grown on seeded PSi. Hexagonal wurtzite of ZnO with dominated by the plane (100), (002), and (101) was found by XRD characterization. Two different peaks in UV range and visible range can be attributed to ZnO nano-flower and various defects of ZnO, respectively.

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