Improved Interference Filter Structures Made of Porous Silicon

1996 ◽  
Vol 452 ◽  
Author(s):  
M. Thönissen ◽  
M. G. Berger ◽  
M. Krüger ◽  
W. Theiβ ◽  
S. Hilbrich ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Interference Filter ◽  
Refractive Indices ◽  
Bragg Reflectors ◽  
Continuous Change ◽  
Specific Design ◽  
Fabry Perot ◽  
Current Densities ◽  
Substrate Doping ◽  
Filter Structures

AbstractRecently passive optical devices like filter structures or waveguides based on porous silicon have attracted high interest due to their easy and cheap fabrication. We have formed interference filters using porous silicon by changing the current density during formation. For the specific design of these filter structures a calibration of the etch rate and the refractive indices is required. Therefore we have determined the effective dielectric function for different substrate doping levels and anodization current densities by fitting reflectance spectra. Based on these results different kinds of reflectance filters consisting of discrete layers (Bragg reflectors, Fabry-Perot filters) as well as filters with a continuous change of the refractive indices with depth (rugate-filters) can be realised. Furthermore we present applications of these filter structures such as anti-reflectance coatings and high quality mirrors.

Elaboration and Light Emission Properties of Low Doped p-Type Porous Silicon Microcavities

1996 ◽  
Vol 452 ◽  
Author(s):  
G. Lérondel ◽  
P. Ferrand ◽  
R. Romestain
Keyword(s):  
Porous Silicon ◽  
Near Infrared ◽  
Light Emission ◽  
Narrow Band ◽  
Bragg Reflectors ◽  
Strong Emission ◽  
Luminescence Efficiency ◽  
Fabry Perot ◽  
Current Densities ◽  
P Type

AbstractWe account for the elaboration of Bragg reflectors and microcavities based on efficiently luminescent porous silicon. A characterisation of very thin porous silicon layers obtained with current densities of formation varying from 1.5 mA to 300 mA is presented. The resulting refractive index variation (typically from 1.37 to 1.86 at 700 nm) enables the elaboration of high quality Bragg reflectors and Fabry-Perot filters from the yellow to the near infrared. Although low doped p-type porous silicon develops rougher interfaces than highly doped p-type porous silicon, its better luminescence efficiency has enabled us to elaborate microcavities with a strong emission in a narrow band.

scholarly journals Refractive index evaluation of porous silicon using Bragg reflectors

2018 ◽  
Vol 64 (1) ◽  
pp. 72 ◽  
Author(s):  
D. Estrada-Wiese ◽  
J.A. Del Río
Keyword(s):  
Refractive Index ◽  
Porous Silicon ◽  
Simple Procedure ◽  
Merit Function ◽  
Refractive Indices ◽  
Bragg Reflectors ◽  
Photonic Bandgaps ◽  
Photonic Structures ◽  
Index Evaluation

There are two main physical properties needed to fabricate 1D photonic structures and form perfect photonic bandgaps: the quality of thethickness periodicity and the refractive index of their components. Porous silicon (PS) is a nano-structured material widely used to prepare 1Dphotonic crystals due to the ease of tuning its porosity and its refractive index by changing the fabrication conditions. Since the morphologyof PS changes with porosity, the determination of PS’s refractive index is no easy task. To find the optical properties of PS we can usedifferent effective medium approximations (EMA). In this work we propose a method to evaluate the performance of the refractive index ofPS layers to build photonic Bragg reflectors. Through a quality factor we measure the agreement between theory and experiment and thereinpropose a simple procedure to determine the usability of the refractive indices. We test the obtained refractive indices in more complicatedstructures, such as a broadband Vis-NIR mirror, and by means of a Merit function we find a good agreement between theory and experiment.With this study we have proposed quantitative parameters to evaluate the refractive index for PS Bragg reflectors. This procedure could havean impact on the design and fabrication of 1D photonic structures for different applications.

scholarly journals Investigation of 1d Photonic Crystal Based on Nano-porous Silicon Multilayer for Optical Filtering

2011 ◽  
Vol 21 (1) ◽  
pp. 89
Author(s):  
Do Thuy Chi ◽  
Bui Huy ◽  
Nguyen Thuy Van ◽  
Pham Van Hoi
Keyword(s):  
Photonic Crystal ◽  
Porous Silicon ◽  
Interference Filter ◽  
Dielectric Waveguides ◽  
Applied Current ◽  
Reflection And Transmission ◽  
Graded Index ◽  
Current Densities ◽  
1D Photonic Crystal ◽  
Good Agreement

We present the fabrication, simulation, and measurements of 1D photonic crystal based on nano-porous silicon multilayer designed as an optical interference filter. Using electro-chemical etching with timely repeat steps of applied current densities, we fabricated a multilayer structure composed of alternating high- and low-index layer which achieved 90% power reflectivity at wavelength range of 1400-3000 nm. The simulation is relying on the Transfer Matrix Method (TMM) to design and predict the optical properties of nano-porous silicon multilayer as well as the relation between anodization parameters with reflection spectra. The measured reflection and transmission spectra of the nano-porous silicon multilayer show good agreement with simulation. This technique could provide a convenient and economical method to produce filters, cavities, and graded-index dielectric waveguides in the future.

Méthode de fabrication et caractéristiques photographiques de photosystèmes de type Fabry-Pérot

1983 ◽  
Vol 61 (8) ◽  
pp. 1212-1217
Author(s):  
Daniel Saint-Germain ◽  
Germain Boivin
Keyword(s):  
Interference Filter ◽  
Refractive Indices ◽  
Lead Iodide ◽  
Photosensitive Element ◽  
Fabry Perot ◽  
Made In

The use of a Fabry-Pérot filter as a positive transmission photosystem is discussed first. Its construction is similar to an interference filter with multistacked mirrors. A lead–iodide and copper photosensitive element is made in such a way as to be combined with the multistacked mirrors. We then propose a method to fabricate the filter which is independent of the refractive indices of the materials. Finally, we present the sensitivity and contrast results of the photosystems.

Reflectivity Modelling of All-Porous-Silicon Distributed Bragg Reflectors and Fabry-Perot Microcavities

2005 ◽  
Vol 10 (1) ◽  
pp. 83-91 ◽  
Author(s):  
N. Samuolienė ◽  
E. Šatkovskis
Keyword(s):  
Porous Silicon ◽  
Wavelength Range ◽  
Active Layer ◽  
Optical Parameters ◽  
Bragg Reflectors ◽  
Distributed Bragg Reflectors ◽  
Bragg Mirror ◽  
Number Of Layers ◽  
Fabry Perot ◽  
The Impact

Herein, the problem of nanocrystaline silicon laser and its importance in microelectronics are discussed upon. The features of vertical Fabry-Perot microcavities made on the base of porous silicon are described. The responses of the reflectivity of the distributed reflection Bragg mirrors and Fabry-Perot microcavities were found using transfer matrixes method for this purpose. Inherent optical parameters of porous silicon, deposited by electrochemical etch, were used in the calculations. The calculation of the reflectivity of the distributed reflection Bragg mirrors with front active layer of nanostructural porous silicon had been examined. In the second part, the features of Fabry-Perot microcavities on variation of the number of layers of the front or rear mirrors are described. The impact of the thickness of the active nanocrystaline silicon spacer between two distributed reflection Bragg mirrors upon the spectra of optical reflectivity of Fabry-Perot microcavities in the wavelength range of 0.4–0.9 µm had been examined as well. The made conclusions are important for improvement of the thickness of the active porous silicon spacer in front of Bragg mirror and the features of Fabry-Perot microcavities.

Porous silicon-based Bragg reflectors and Fabry-Perot interference filters for photonic applications

2006 ◽  
Author(s):  
Dharmalingam Mangaiyarkarasi ◽  
Mark B.H. Breese ◽  
Ow Yueh Sheng ◽  
Kambiz Ansari ◽  
Chellappan Vijila ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Bragg Reflectors ◽  
Interference Filters ◽  
Fabry Perot ◽  
Silicon Based

Fabrication of three dimensional porous silicon distributed Bragg reflectors

2008 ◽  
Vol 93 (22) ◽  
pp. 221905 ◽  
Author(s):  
D. Mangaiyarkarasi ◽  
M. B. H. Breese ◽  
Y. S. Ow
Keyword(s):  
Porous Silicon ◽  
Three Dimensional ◽  
Bragg Reflectors ◽  
Distributed Bragg Reflectors

scholarly journals UV distributed Bragg reflectors build from porous silicon multilayers

2015 ◽  
Vol 10 ◽  
Author(s):  
F. Morales ◽  
G. Garcia ◽  
A. Luna ◽  
R. Lopez ◽  
E. Rosendo ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Bragg Reflectors ◽  
Distributed Bragg Reflectors
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