Optical Applications of Macroporous Silicon

2000 ◽  
Vol 638 ◽  
Author(s):  
Volker Lehmann
Keyword(s):  
Photonic Band Gap ◽  
Optical Quality ◽  
Imaging Systems ◽  
Macroporous Silicon ◽  
Pass Filter ◽  
High Optical Quality ◽  
Optical Cavities ◽  
Optical Applications ◽  
Two Dimensional Photonic Crystal ◽  
Photonic Band

AbstractTwo promising optical applications of macroporous silicon are presented. Due to the high contrast in dielectric constant between the air filled pores and the silicon walls the porous structure exhibits a photonic band gap for infrared radiation perpendicular to the pore axis. By photolithograpic patterning waveguides and optical cavities can be realized in this two-dimensional photonic crystal. Along the pore axis a short-pass filter characteristic is observed for ultraviolet and visible light. Such macropore filters are of high optical quality and may replace conventional filters in imaging systems.

Kz component dependence of photonic band gap in two-dimensional photonic crystal

2011 ◽  
Author(s):  
Xuan Guo ◽  
Lihong Han ◽  
Guifang Yuan ◽  
Zhongyuan Yu ◽  
Yumin Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Two Dimensional ◽  
Dimensional Photonic Crystal ◽  
Two Dimensional Photonic Crystal ◽  
Photonic Band

Tuning of 2-D Silicon Photonic Crystals

2002 ◽  
Vol 722 ◽  
Author(s):  
H. M. van Driel ◽  
S.W. Leonard ◽  
J. Schilling ◽  
R.B. Wehrspohn
Keyword(s):  
Band Gap ◽  
High Frequency ◽  
Optical Band Gap ◽  
Photonic Band Gap ◽  
Macroporous Silicon ◽  
Optically Pumped ◽  
Electron Hole ◽  
Silicon Photonic ◽  
Induced Changes ◽  
Photonic Band

AbstractWe demonstrate two ways in which the optical band-gap of a 2-D macroporous silicon photonic crystal can be tuned. In the first method the temperature dependence of the refractive index of an infiltrated nematic liquid crystal is used to tune the high frequency edge of the photonic band gap by up to 70 nm as the temperature is increased from 35 to 59°C. In a second technique we have optically pumped the silicon backbone using 150 fs, 800 nm pulses, injecting high density electron hole pairs. Through the induced changes to the dielectric constant via the Drude contribution we have observed shifts up to 30 nm of the high frequency edge of a band-gap.

A Two-Dimensional Photonic Crystal Structure for Improving Efficiency of Pbs Quantum Dots Electroluminescence Devices

2012 ◽  
Vol 529 ◽  
pp. 14-18
Author(s):  
Pei Liu ◽  
Xiao Song Zhang ◽  
Chuan Zhen Xin ◽  
Meng Zhen Li ◽  
Lan Li
Keyword(s):  
Quantum Dots ◽  
Photonic Crystal ◽  
Light Propagation ◽  
Photonic Band Gap ◽  
Gap Effect ◽  
Diffraction Effect ◽  
Two Dimensional ◽  
Two Dimensional Photonic Crystal ◽  
Pbs Quantum Dots ◽  
Photonic Band

In this research, a triangular two-dimensional (2D) photonic crystal (PC) was hypothetically introduced into the active layer of a PbS quantum dots (QDs) electroluminescent (EL) device. The attributes of the photonic band gap effect and diffraction effect were considered and evaluated for device performance improvement. We designed and optimized the 2D-PC structure parameters to enhance the emission intensity at wavelength 1124 nm. The optimal structure parameter of PC is determined by normalized radius of r/a=0.49 and lattice constant of a=540 nm when the thickness of PC slab h is 74 nm. The 3D stimulation view of light propagation validates and supports the proposed strategy. The results provide a theoretical prediction for ideal PbS QDs-based EL device.

scholarly journals Three-dimensional macroporous silicon photonic crystal with large photonic band gap

2005 ◽  
Vol 86 (1) ◽  
pp. 011101 ◽  
Author(s):  
J. Schilling ◽  
J. White ◽  
A. Scherer ◽  
G. Stupian ◽  
R. Hillebrand ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Macroporous Silicon ◽  
Silicon Photonic ◽  
Photonic Band

scholarly journals Fluorescent Aptamer Immobilization on Inverse Colloidal Crystals

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4326 ◽  
Author(s):  
Andrea Chiappini ◽  
Laura Pasquardini ◽  
Somayeh Nodehi ◽  
Cristina Armellini ◽  
Nicola Bazzanella ◽  
...  
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Transmission Band ◽  
Optical Quality ◽  
Dna Aptamer ◽  
Inverse Opal ◽  
High Optical Quality ◽  
Inverse Opals ◽  
Assembly Method

In this paper, we described a versatile two steps approach for the realization of silica inverse opals functionalized with DNA-aptamers labelled with Cy3 fluorophore. The co-assembly method was successfully employed for the realization of high quality inverse silica opal, whilst the inverse network was functionalized via epoxy chemistry. Morphological and optical assessment revealed the presence of large ordered domains with a transmission band gap depth of 32%, after the functionalization procedure. Finite Difference Time-Domain (FDTD) simulations confirmed the high optical quality of the inverse opal realized. Photoluminescence measurements evidenced the effective immobilization of DNA-aptamer molecules labelled with Cy3 throughout the entire sample thickness. This assumption was verified by the inhibition of the fluorescence of Cy3 fluorophore tailoring the position of the photonic band gap of the inverse opal. The modification of the fluorescence could be justified by a variation in the density of states (DOS) calculated by the Plane Wave Expansion (PWE) method. Finally, the development of the aforementioned approach could be seen as proof of the concept experiment, suggesting that this type of system may act as a suitable platform for the realization of fluorescence-based bio-sensors.

scholarly journals Photostable Anisometric Lanthanide Complexes as Promising Materials for Optical Applications

Photonics ◽  
2019 ◽  
Vol 6 (4) ◽  
pp. 110 ◽  
Author(s):  
Andrey Knyazev ◽  
Maxim Karyakin ◽  
Yuriy Galyametdinov
Keyword(s):  
Processing Technique ◽  
Optical Quality ◽  
Melt Processing ◽  
High Optical Quality ◽  
Alternative Approach ◽  
Luminescent Films ◽  
Application Problem ◽  
Original Films ◽  
Optical Applications ◽  
Highly Uniform

Uniform luminescent films with high optical quality are promising materials for modern molecular photonics. Such film materials based on β-diketonate complexes of lanthanides have the following application problem: rapid luminescence degradation under UV radiation, low thermostability, poor mechanical properties, and aggregation propensity. An alternative approach to solving these problems is the use of anisometric analogues of β-diketonate compounds of lanthanides (III). The main advantage of such compounds is that they do not crystallize because of long hydrocarbon substituents in the structure of complexes, so they can be used to fabricate thin nano-, micro-, and macroscale uniform film materials by a melt-processing technique at relatively low temperatures, as well as by spin-coating. The method of fabrication of microscale luminescent film materials with controlled optical properties from anisometric analogues of Ln(DBM)3Phen and Ln(bzac)3Phen complexes (Ln = Eu, Tb) is proposed in this paper. Within the framework of this research, we developed original films which are highly uniform and transparent. An important advantage of these films is their high photostability and potential for applications as reusable luminescent sensors and light converters.

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