Feroz Ahmed - Academia.edu (original) (raw)
Papers by Feroz Ahmed
Sensors
In this work, a highly sensitive dual-core configured microchannel-based plasmonic refractive ind... more In this work, a highly sensitive dual-core configured microchannel-based plasmonic refractive index (RI) sensor was investigated, which can be used for low RI detection. Both the sensing layer and the plasmonic material layer were built outside of the fiber design to detect the surrounding medium’s RI changes. Additionally, the effects of different plasmonic materials gold (Au), silver (Ag), and copper (Cu) toward sensitivity were investigated for the same structure. An adhesive agent was used in this work, titanium dioxide (TiO2), and was coated on top of the plasmonic material to prevent the oxidation of Ag and Cu. The coupling strength between the fundamental mode and the surface plasmon polariton (SPP) mode was observed to be very strong due to the TiO2 adhesive agent. With a resolution of 7.41 × 10−7 RIU, maximum wavelength sensitivity (WS) of 135,000 nm/RIU and amplitude sensitivity (AS) of 3239 RIU−1 were achieved using the proposed sensor while using Au as a plasmonic materi...
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Photonics
This paper proposes a hexagonal photonic crystal fiber (H-PCF) structure with all circular air ho... more This paper proposes a hexagonal photonic crystal fiber (H-PCF) structure with all circular air holes in order to simultaneously achieve ultrahigh birefringence and high nonlinearity. The H-PCF design consists of an asymmetric core region, where one air hole is a reduced diameter and the air hole in its opposite vertex is omitted. The light-guiding properties of the proposed H-PCF structure were studied using the full-vector finite element method (FEM) with a circular perfectly matched layer (PML). The simulation results showed that the proposed H-PCF exhibits an ultrahigh birefringence of 3.87 × 10−2, a negative dispersion coefficient of −753.2 ps/(nm km), and a nonlinear coefficient of 96.51 W−1 km−1 at an excitation wavelength of 1550 nm. The major advantage of our H-PCF design is that it provides these desirable modal properties without using any non-circular air holes in the core and cladding region, thus making the fiber fabrication process much easier. The ultrahigh birefringe...
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Sensors
In this paper, a low-loss, spiral lattice photonic crystal fiber (PCF)-based plasmonic biosensor ... more In this paper, a low-loss, spiral lattice photonic crystal fiber (PCF)-based plasmonic biosensor is proposed for its application in detecting various biomolecules (i.e., sugar, protein, DNA, and mRNA) and biochemicals (i.e., serum and urine). Plasmonic material gold (Au) is employed externally to efficiently generate surface plasmon resonance (SPR) in the outer surface of the PCF. A thin layer of titanium oxide (TiO2) is also introduced, which assists in adhering the Au layer to the silica fiber. The sensing performance is investigated using a mode solver based on the finite element method (FEM). Simulation results show a maximum wavelength sensitivity of 23,000 nm/RIU for a bio-samples refractive index (RI) detection range of 1.32–1.40. This sensor also exhibits a very low confinement loss of 0.22 and 2.87 dB/cm for the analyte at 1.32 and 1.40 RI, respectively. Because of the ultra-low propagation loss, the proposed sensor can be fabricated within several centimeters, which reduce...
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IEEE Sensors Journal
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2015 International Conference on Advances in Electrical Engineering (ICAEE), 2015
— This study focuses on the implementation of web based low cost yet effective remote laboratory ... more — This study focuses on the implementation of web based low cost yet effective remote laboratory system for engineering education to utilize limited resources for improving engineering student's practical knowledge as well as self learning ability. The proposed system provides practical experience to the students in the field of power electronics and telecommunications. This lab allows the students to perform experiment by controlling various experimental apparatus on real time from their home or any preferred location using the internet connection. Several experiments related to Power electronics and Telecommunications have been designed for this remote lab. The system is flexible and the range of laboratory experiments can be expanded as required without any complexity. This initializes an openly integrated environment which facilitates the sharing of not only hardware resources, but also educational material for enhancing engineering education in developing countries like Bangladesh.
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2016 Future Technologies Conference (FTC), 2016
—An ultra-wideband (UWB) W-shaped patch antenna with defected ground is presented in this paper. ... more —An ultra-wideband (UWB) W-shaped patch antenna with defected ground is presented in this paper. Design, simulation and the analysis of the proposed single layer line feed antenna is done in CST Microwave Studio with 10.3 GHz operating frequency. The simulated results reveal that, the presented W-shaped line fed antenna offers a very wide bandwidth of 507 MHz ranging from 10.146 GHz to 10.653 GHz. Good voltage standing wave ratio (VSWR) and radiation pattern characteristics are obtained in the frequency band of interest, which eliminates the possible existence of trade-offs among gain, the design of the antenna and VSWR to obtain desired bandwidth enhancement. Along with the design details of the proposed antenna, simulated results are presented in this work.
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2015 18th International Conference on Computer and Information Technology (ICCIT), 2015
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2005 Pacific Rim Conference on Lasers & Electro-Optics, 2005
ABSTRACT Multi-wavelength lasing in an EDF laser by means of phase modulation and its spectral li... more ABSTRACT Multi-wavelength lasing in an EDF laser by means of phase modulation and its spectral lines power equalization using polarization controller, which is incorporated in a PMF Lyot-Sagnac filter are proposed and experimentally demonstrated.
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Optical Review, 2003
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Optical Review, 2003
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2007 10th International Conference on Computer and Information Technology, 2007
Abstracta channel-spacing tunable and switchable multiwavelength Erbium-doped fiber laser (MW-ED... more Abstracta channel-spacing tunable and switchable multiwavelength Erbium-doped fiber laser (MW-EDFL) operating at room temperature is studied using available experimental data. The multiwavelength generation is achieved mainly based on a single segmented ...
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Optical Review, 2001
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2012 International Conference on Informatics, Electronics & Vision (ICIEV), 2012
ABSTRACT In this paper, a new technique of BER minimization in a companding based PAPR reduction ... more ABSTRACT In this paper, a new technique of BER minimization in a companding based PAPR reduction scheme is proposed. In this approach, the conventional companding scheme is only applied for those OFDM signals whose amplitude exceeds a predefined threshold level, which results in lower BER and lower computational time. Though for the proposed scheme, improvement of the PAPR is less than the conventional companding technique, however, BER performance is improved significantly.
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Journal of Networks, 2014
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Modern Applied Science, 2014
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Modern Applied Science, 2014
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Free metallic particles, inside gas insulated switchgear (GIS) apparatus are considered hazardous... more Free metallic particles, inside gas insulated switchgear (GIS) apparatus are considered hazardous to the insulation system, can be detected using acoustic sensors placed on the enclosure. From acoustic measurements, it is rather easy to determine the partial discharge pulses caused by loose or fixed particles. One can readily recognise the motion modes of the free particles by studying the acoustic signal. This paper presents the analysis of free metallic particle motion modes in GIS apparatus from acoustic measurements. The parameters such as maximum acoustic amplitude, number of acoustic pulses, mean value of maximum amplitude of 10 measurements, number of pulses which exceed the specified % of maximum amplitude characterising partial discharge activity of Al as well as Cu particles of different shapes are investigated
Bookmarks Related papers MentionsView impact
Japanese Journal of Applied Physics, 2001
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International journal of Computer Networks & Communications, 2014
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Sensors
In this work, a highly sensitive dual-core configured microchannel-based plasmonic refractive ind... more In this work, a highly sensitive dual-core configured microchannel-based plasmonic refractive index (RI) sensor was investigated, which can be used for low RI detection. Both the sensing layer and the plasmonic material layer were built outside of the fiber design to detect the surrounding medium’s RI changes. Additionally, the effects of different plasmonic materials gold (Au), silver (Ag), and copper (Cu) toward sensitivity were investigated for the same structure. An adhesive agent was used in this work, titanium dioxide (TiO2), and was coated on top of the plasmonic material to prevent the oxidation of Ag and Cu. The coupling strength between the fundamental mode and the surface plasmon polariton (SPP) mode was observed to be very strong due to the TiO2 adhesive agent. With a resolution of 7.41 × 10−7 RIU, maximum wavelength sensitivity (WS) of 135,000 nm/RIU and amplitude sensitivity (AS) of 3239 RIU−1 were achieved using the proposed sensor while using Au as a plasmonic materi...
Bookmarks Related papers MentionsView impact
Photonics
This paper proposes a hexagonal photonic crystal fiber (H-PCF) structure with all circular air ho... more This paper proposes a hexagonal photonic crystal fiber (H-PCF) structure with all circular air holes in order to simultaneously achieve ultrahigh birefringence and high nonlinearity. The H-PCF design consists of an asymmetric core region, where one air hole is a reduced diameter and the air hole in its opposite vertex is omitted. The light-guiding properties of the proposed H-PCF structure were studied using the full-vector finite element method (FEM) with a circular perfectly matched layer (PML). The simulation results showed that the proposed H-PCF exhibits an ultrahigh birefringence of 3.87 × 10−2, a negative dispersion coefficient of −753.2 ps/(nm km), and a nonlinear coefficient of 96.51 W−1 km−1 at an excitation wavelength of 1550 nm. The major advantage of our H-PCF design is that it provides these desirable modal properties without using any non-circular air holes in the core and cladding region, thus making the fiber fabrication process much easier. The ultrahigh birefringe...
Bookmarks Related papers MentionsView impact
Sensors
In this paper, a low-loss, spiral lattice photonic crystal fiber (PCF)-based plasmonic biosensor ... more In this paper, a low-loss, spiral lattice photonic crystal fiber (PCF)-based plasmonic biosensor is proposed for its application in detecting various biomolecules (i.e., sugar, protein, DNA, and mRNA) and biochemicals (i.e., serum and urine). Plasmonic material gold (Au) is employed externally to efficiently generate surface plasmon resonance (SPR) in the outer surface of the PCF. A thin layer of titanium oxide (TiO2) is also introduced, which assists in adhering the Au layer to the silica fiber. The sensing performance is investigated using a mode solver based on the finite element method (FEM). Simulation results show a maximum wavelength sensitivity of 23,000 nm/RIU for a bio-samples refractive index (RI) detection range of 1.32–1.40. This sensor also exhibits a very low confinement loss of 0.22 and 2.87 dB/cm for the analyte at 1.32 and 1.40 RI, respectively. Because of the ultra-low propagation loss, the proposed sensor can be fabricated within several centimeters, which reduce...
Bookmarks Related papers MentionsView impact
IEEE Sensors Journal
Bookmarks Related papers MentionsView impact
2015 International Conference on Advances in Electrical Engineering (ICAEE), 2015
— This study focuses on the implementation of web based low cost yet effective remote laboratory ... more — This study focuses on the implementation of web based low cost yet effective remote laboratory system for engineering education to utilize limited resources for improving engineering student's practical knowledge as well as self learning ability. The proposed system provides practical experience to the students in the field of power electronics and telecommunications. This lab allows the students to perform experiment by controlling various experimental apparatus on real time from their home or any preferred location using the internet connection. Several experiments related to Power electronics and Telecommunications have been designed for this remote lab. The system is flexible and the range of laboratory experiments can be expanded as required without any complexity. This initializes an openly integrated environment which facilitates the sharing of not only hardware resources, but also educational material for enhancing engineering education in developing countries like Bangladesh.
Bookmarks Related papers MentionsView impact
2016 Future Technologies Conference (FTC), 2016
—An ultra-wideband (UWB) W-shaped patch antenna with defected ground is presented in this paper. ... more —An ultra-wideband (UWB) W-shaped patch antenna with defected ground is presented in this paper. Design, simulation and the analysis of the proposed single layer line feed antenna is done in CST Microwave Studio with 10.3 GHz operating frequency. The simulated results reveal that, the presented W-shaped line fed antenna offers a very wide bandwidth of 507 MHz ranging from 10.146 GHz to 10.653 GHz. Good voltage standing wave ratio (VSWR) and radiation pattern characteristics are obtained in the frequency band of interest, which eliminates the possible existence of trade-offs among gain, the design of the antenna and VSWR to obtain desired bandwidth enhancement. Along with the design details of the proposed antenna, simulated results are presented in this work.
Bookmarks Related papers MentionsView impact
2015 18th International Conference on Computer and Information Technology (ICCIT), 2015
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
2005 Pacific Rim Conference on Lasers & Electro-Optics, 2005
ABSTRACT Multi-wavelength lasing in an EDF laser by means of phase modulation and its spectral li... more ABSTRACT Multi-wavelength lasing in an EDF laser by means of phase modulation and its spectral lines power equalization using polarization controller, which is incorporated in a PMF Lyot-Sagnac filter are proposed and experimentally demonstrated.
Bookmarks Related papers MentionsView impact
Optical Review, 2003
Bookmarks Related papers MentionsView impact
Optical Review, 2003
Bookmarks Related papers MentionsView impact
2007 10th International Conference on Computer and Information Technology, 2007
Abstracta channel-spacing tunable and switchable multiwavelength Erbium-doped fiber laser (MW-ED... more Abstracta channel-spacing tunable and switchable multiwavelength Erbium-doped fiber laser (MW-EDFL) operating at room temperature is studied using available experimental data. The multiwavelength generation is achieved mainly based on a single segmented ...
Bookmarks Related papers MentionsView impact
Optical Review, 2001
Bookmarks Related papers MentionsView impact
2012 International Conference on Informatics, Electronics & Vision (ICIEV), 2012
ABSTRACT In this paper, a new technique of BER minimization in a companding based PAPR reduction ... more ABSTRACT In this paper, a new technique of BER minimization in a companding based PAPR reduction scheme is proposed. In this approach, the conventional companding scheme is only applied for those OFDM signals whose amplitude exceeds a predefined threshold level, which results in lower BER and lower computational time. Though for the proposed scheme, improvement of the PAPR is less than the conventional companding technique, however, BER performance is improved significantly.
Bookmarks Related papers MentionsView impact
Journal of Networks, 2014
Bookmarks Related papers MentionsView impact
Modern Applied Science, 2014
Bookmarks Related papers MentionsView impact
Modern Applied Science, 2014
Bookmarks Related papers MentionsView impact
Free metallic particles, inside gas insulated switchgear (GIS) apparatus are considered hazardous... more Free metallic particles, inside gas insulated switchgear (GIS) apparatus are considered hazardous to the insulation system, can be detected using acoustic sensors placed on the enclosure. From acoustic measurements, it is rather easy to determine the partial discharge pulses caused by loose or fixed particles. One can readily recognise the motion modes of the free particles by studying the acoustic signal. This paper presents the analysis of free metallic particle motion modes in GIS apparatus from acoustic measurements. The parameters such as maximum acoustic amplitude, number of acoustic pulses, mean value of maximum amplitude of 10 measurements, number of pulses which exceed the specified % of maximum amplitude characterising partial discharge activity of Al as well as Cu particles of different shapes are investigated
Bookmarks Related papers MentionsView impact
Japanese Journal of Applied Physics, 2001
Bookmarks Related papers MentionsView impact
International journal of Computer Networks & Communications, 2014
Bookmarks Related papers MentionsView impact