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Designing a high sensitivity device has been a research focus and a requirement in biosensor application. We found out that one of the way to increase the sensitivity of an optical biosensor device is to increase the interaction area between the target analyte and the sensing region of the biosensor device where the light propagates. Using a high quality-factor (Q) one dimensional photonic crystal...
A novel hydrogen (H2) sensor was developed using optical fiber coated with manganese dioxide (MnO2) nanostructures. Optical multimode fiber (MMF) of 125μm in diameter as the transducing platform was tapered to 20μm to enhance the evanescent field of the light propagates in the fiber core. The tapered fiber was coated with MnO2 nanograins synthesised via chemical bath deposition (CBD) process. Catalytic...
This paper is intended to investigate the copper-graphene surface plasmon resonance (SPR)-based biosensor by considering the high adsorption efficiency of graphene. Copper (Cu) is used as a plasmonic material whereas graphene is used to prevent Cu from oxidation and enhance the reflectance intensity. Numerical investigation is performed using finite-difference-time-domain (FDTD) method by comparing...
We report the Photonic Crystal (PhC) nanowires performance for potential phototodetectors integration application. The refractive index of PhC can be tailored to guide specific resonance wavelength precisely. This paper presents the numerical approach of 1D PhC with 12 periodic holes to observe the range of stop band acquired, transmission and the quality factor of the resonance wavelengths. By splitting...
In this paper we have shown that it is possible to obtain the complete phononic band gaps in a square lattice of pillar-based phononic crystal. Bigger phononic band gap width can be obtained by increasing the height of pillar and it filling fraction, f. It is shown that the gap-to-mid-gap ratio of pillar at h/a = 0.5 has increased by 21.2% when it height increased to 1.25 and the gap-to-mid-gap ratio...
This paper presents the simulation of a photonic crystal (PhC) cavity in low index contrast materials- Gallium Nitride on the sapphire substrate using two-dimensional (2D) Finite Difference Time Domain method (FDTD). We have performed the simulation based on H1 PhC configurations with the variation of lattice constant. We have obtained the quality factor of approximately 2200 and 1700 at the wavelength...
Optical filter is very important components in WDM network. MRR is a basic structure to design the optical filter because of easy to design for improving its performance. This paper discusses an innovative structure of the MRR, which is Polymer Triple Coupler Ring Resonators (PTCRR) for optical filter applications. Values of width between bus and ring and values of radius of the ring in the structure...
In this article, segmented slot waveguide structures are designed and analysed numerically. We present a theoretical investigation of overlap factors and low half voltage for different segmented slot waveguide structures to determine optimised geometrical dimensions based on slot widths. Results shows that high overlap factor, and low half voltage, occurs for 200 and 300 nm periodicities at a 100...
In this paper, we investigate the wave dispersion of two dimensional pillar-based phononic crystal surrounded in liquid medium. An unit cell structure with reduced pillar height (hp/a)=0.5 and reduced radius (rp/a)=0.3 is simulated using Finite Element Method. The geometrical parameter is chosen to demonstrate a local resonance mechanism that allow the confinement of elastic energy at the interface...
We have theoretically demonstrated the variation of geometrical parameters for the cavities design of one dimensional (1D) photonic crystal nanocavity based on silicon on insulator (SOI) waveguides. To evaluate the cavity numerically, we have successfully computed it using the 2D finite difference time domain (FDTD) approach. We have varied the geometrical hole size, lattice and number of cavity....
In this paper we report successful experimental demonstration of consistency in controlling the resonance quality factor (Q-factor) value in the range from 1000 to 80,000, together with good free spectral range (FSR) control in the range from 30 nm to 62 nm — for an extended cavity. We have also demonstrated good repeatability of high Q-factor values for 1D photonic crystal (PhC)/Photonic wire (PhW)...
This work presents a designed of boost converter Hybrid Micro Energy Harvester (HMEH) using thermal and vibration of human body for biomedical application. Thermal converts temperature differences directly into electrical energy. While vibration is based on human movement like walking and shaking body that is able to generate an AC voltage. Having two sources overcome the limitation caused by a single...
Summary form only given: We present photonic wire device structures based on silicon on insulator (SOI) - in particular tapered Bragg gratings. Different types of taper specification have been introduced to enable efficient coupling of light into the grating region. The structure has been simulated using the 2D FDTD method in the Fullwave software from Rsoftreg- and shows substantial improvement in...
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