Conventional band demultiplexer with high quality factor and transmission power based on four optimized shaped photonic crystal resonators

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Fateh Larioui ◽  
Mohamed Redha Lebbal ◽  
Touraya Bouchemat ◽  
Mohamed Bouchemat
Keyword(s):  
Quality Factor ◽  
Filter Design ◽  
Photonic Band Gap ◽  
Transmission Band ◽  
High Sensitivity ◽  
Spectral Width ◽  
Optical Quality ◽  
Transmission Ratio ◽  
Plane Wave Method ◽  
Photonic Band

AbstractIn this work, we propose a new filter design based on a ring resonator. This structure has 99% transmission ratio and high sensitivity to detect small refractive index variations of the order of 0.002. More specifically, the small size of this resonator gives the advantage to model a demultiplexer of size 463 µm2 based on four ports which operates in the conventional transmission band. Also, we show that our demultiplexer structure can reach more than 90% transmission ratio with an optical quality factor of about 3800, the spectral width is 0.72 nm and a crosstalk between −13.28 and −32.13. In our study, we emphasized the plane wave method to study the photonic band gap and FDTD to determine the transmission spectrum.

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.

SELF-GUIDING IN LOW-INDEX-CONTRAST PLANAR PHOTONIC CRYSTALS

2004 ◽  
Vol 14 (03) ◽  
pp. 720-725
Author(s):  
CAIHUA CHEN ◽  
ZHAOLIN LU ◽  
SHOUYUAN SHI ◽  
DENNIS W. PRATHER
Keyword(s):  
Photonic Crystals ◽  
Light Cone ◽  
Total Internal Reflection ◽  
Photonic Band Gap ◽  
Contrast Material ◽  
Band Frequency ◽  
Plane Wave Method ◽  
Dispersion Engineering ◽  
Index Contrast ◽  
Photonic Band

This paper presents a new lateral confinement mechanism based on the self-collimation effect in planar photonic crystals (PhCs). In this mechanism, planar PhCs with approximately flat equifrequency contours (EFCs) are utilized for laterally confining the light and total internal reflection (TIR) is used for the vertical confinement. Since this mechanism relies on dispersion engineering, no photonic band gap nor defect modes are required. Using this approach, it is possible to engineer flat EFCs completely below the light cone using relatively low-index-contrast material systems. Therefore, in this work we first engineer a low-index-contrast planar PhC with approximately flat EFCs in the first band, which is always below the light cone. Then, we investigate the lateral divergence of self-guided beams in this structure using the plane wave method (PWM). It is found that light with a narrow band frequency in the first band can be very well self-confined laterally.

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.

Augmented-plane-wave method for photonic band-gap materials

1998 ◽  
Vol 57 (15) ◽  
pp. 8819-8822 ◽  
Author(s):  
W. C. Sailor ◽  
F. M. Mueller ◽  
Pierre R. Villeneuve
Keyword(s):  
Plane Wave ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Wave Method ◽  
Augmented Plane Wave ◽  
Plane Wave Method ◽  
Augmented Plane Wave Method ◽  
Photonic Band Gap Materials ◽  
Photonic Band

Excellent Quality Factor Ultra-Compact Optical Communication Filter on Ring-Shaped Cavity

2019 ◽  
Vol 40 (1) ◽  
pp. 21-25 ◽  
Author(s):  
S. Naghizade ◽  
S. M. Sattari-Esfahlan
Keyword(s):  
Integrated Circuits ◽  
Quality Factor ◽  
Photonic Band Gap ◽  
Fdtd Method ◽  
Optical Filter ◽  
Transmission Efficiency ◽  
Compact Structure ◽  
Optical Integrated Circuits ◽  
Average Transmission ◽  
Photonic Band

Abstract In this paper, we propose a high-quality factor (QF) ultra-compact structure for designing all optical filter based on two dimensional (2D) photonic crystals that can operate in third communication window range (1550 nm). The simulation results calculated by using 2D finite difference time domain (FDTD) method and photonic band gap (PBG) region are calculated by plane wave expansion (PWE) method. The average transmission efficiency, average QF and optical full width at half maximum (FWHM) bandwidth more than 95 %, 4300 and 0.4 nm obtained, respectively. The value of QF for the proposed structure is a major QF for ring resonator-based filters. We studied the effect of changing the air background to liquid crystal (LC) surrounding the dielectric rods. Results showed that by increasing LC refractive index (n) peak of wavelengths red shifted. The footprint of proposed filter is 160 ${{\mu}}{{\rm{m}}^{\rm{2}}}$ which make the proposed structure promising candidate for optical integrated circuits.

scholarly journals Tamm plasmon-polaritons structures with Bi-substituted garnet layers

2018 ◽  
Vol 185 ◽  
pp. 02016 ◽  
Author(s):  
Tatyana Mikhailova ◽  
Alexander Shaposhnikov ◽  
Anatoly Prokopov ◽  
Andrey Karavainikov ◽  
Sergey Tomilin ◽  
...  
Keyword(s):  
Electric Field ◽  
Quality Factor ◽  
Faraday Rotation ◽  
Light Wave ◽  
Optical Quality ◽  
Metal Coating ◽  
Magnetic Layers ◽  
Iron Garnet ◽  
Photonic Band ◽  
Plasmon Polaritons

New original Tamm plasmon-polaritons (TPP) structures with Bi-substituted iron garnet and Au plasmonic layers were proposed, synthesized and investigated. The structures with single and double garnet layers were modelled to form a TPP mode at the center of photonic band gab. The top Au layer has the gradient thickness varied in the range from 0 to 65.2 nm. It was found the features of TPP resonances as a function of the thickness of metal coating. The resonances on TPP have the maximum optical quality factor and transmission at the vicinity of Au thickness of 30 nm. These configurations are optimum to form the highest intensity of electric field of light wave in the area of the magnetic layers. It was found the spectral blue and red shifts of TPP mode with increasing of Au thickness. The blue and red shifts can be explained respectively by structural and thickness changes of Au coating. The maximum resonant values of Faraday rotation were –2.1° at 664 nm and –12.3° at 645 nm for structures with single and double garnet layers, respectively, and thickness of Au coating of 65.2 nm.

scholarly journals Зависимость спектра генерации и синхронизации мод от ширины запрещенной фотонной зоны в гетеролазерах класса С с распределенной обратной связью волн в резонаторе Фабри-Перо

2021 ◽  
Vol 55 (9) ◽  
pp. 758
Author(s):  
Е.Р. Кочаровская ◽  
В.А. Кукушкин ◽  
А.В. Мишин ◽  
Вл.В. Кочаровский ◽  
В.В. Кочаровский
Keyword(s):  
Numerical Solution ◽  
Photonic Band Gap ◽  
Spectral Width ◽  
Mode Locking ◽  
Periodic Sequence ◽  
Distributed Feedback ◽  
External Modulation ◽  
Fabry Perot ◽  
Propagating Waves ◽  
Photonic Band

Based on the numerical solution to the nonlinear Maxwell-Bloch equations, the joint implementation of active (parametric) and passive (coherent) mode locking for a class C heterolaser with a low-Q combined Fabry-Perot cavity in the presence of an effective distributed feedback of counter-propagating waves is demonstrated. It is shown that the multiplicity of the spectral width of the photonic band gap of the cavity to the intermode spacing far from this zone contributes to the effective phasing of quasi-monochromatic quasi-equidistant modes, thus making it possible a phenomenon of parametric coherent self-mode-locking. A number of examples are used to demonstrate typical properties of a quasi-periodic sequence of soliton-like pulses generated in the found regime, which does not require external modulation of the pump or laser parameters, or the placement of a fast-saturating absorber in it.

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