Milad Jahangiri, Gholam-Mohammad Parsanasab, Fatemeh Moradiani - Oct. 12, 2023
The Control of the gain and loss in microcavities, especially microrings, and discs, plays a crucial role in harnessing the excited modes in these types of microlasers. In multi-microring configurations, the Vernier effect eliminates various excited modes within the system, while simultaneously stre ...
Read MoreM Amin Khanpour, Fatemeh Moradiani, Gholam-Mohammad Parsanasab, R Karimzadeh - July 1, 2023
Geometrical parameters of coupled plasmonic resonators that consist of micro-disk and micro-ring structures have been investigated numerically, and changes in the Q factor, mode volume, and Purcell coefficient of the investigated structure have been calculated according to changes in geometrical var ...
Read MoreFatemeh Moradiani, Pegah Eivazy Arvanagh, Gholam-Mohammad Parsanasab, Alireza Kavosi - May 8, 2023
Cavity mode manipulation in lasers is urgent for the stable single-mode operation of a microring laser. Here, we propose and experimentally demonstrate the plasmonic whispering gallery mode microring laser for strong coupling between local plasmonic resonances and whispering gallery modes (WGM) on t ...
Read MoreMilad Jahangiri, Fatemeh Moradiani, Gholam-Mohammad Parsanasab, Mohsen Mirmohammadi - May 1, 2023
The development of single-mode lasers with a high side-mode suppression ratio (SMSR) is challenging but highly desirable for integrated photonics devices and long-distance communications due to their high spectral purity and stability. Here, we demonstrate a single-mode laser with a high side-mode s ...
Read MoreTahereh Azargoshasb, Roghaieh Parvizi, H Ali Navid, Gholam-Mohammad Parsanasab, Hadi Heidari - Dec. 1, 2022
A versatile lossy mode resonance (LMR) sensor is developed for Epinephrine monitoring based on the state-of-the-art molecular imprinting technique over an optical fiber. The optical absorption concept of the LMR-based sensor is proven by incorporating an amino silane-functionalized graphene oxide (S ...
Read MoreMojtaba Rahimi, Mohammad Malekmohammad, Majid Taghavi, Mohammad Noori, Gholam-Mohammad Parsanasab - June 27, 2022
In this paper, a differential micro-opto-electro-mechanical system (MOEMS) accelerometer based on the Fabry-Pérot (FP) micro-cavities is presented. The optical system of the device consists of two FP cavities and the mechanical system is composed of a proof mass that is suspended by four springs. Th ...
Read MoreMajid Taghavi, Abolfazl Abedi, Gholam-Mohammad Parsanasab, Mojtaba Rahimi, Mohammad Noori, Hamzeh Nourolahi, Hamid Latifi - June 6, 2022
In this paper, a closed-loop micro-opto-electro-mechanical system (MOEMS) accelerometer based on the Fabry-Pérot (FP) interferometer is presented. The FP cavity is formed between the end of a cleaved single-mode optical fiber and the cross-section of a proof mass (PM) which is suspended by four U-sh ...
Read MoreReza Gholamzadeh, Hassan Salarieh, Gholam Mohammad Parsanasab, Javad Akbari - May 1, 2022
A high sensitive optical MEMS accelerometer is proposed, which works by changing the effective refractive index of a microring relied on intensity modulation of light wave. The proposed optical sensing system consists of a microring, waveguide, and a proof mass. Acceleration causes lateral displacem ...
Read MoreTahereh Azargoshasb, Roghaieh Parvizi, H Ali Navid, Gholam-Mohammad Parsanasab, Hadi Heidari - March 21, 2022
For the first time, a versatile lossy mode resonance (LMR) sensor was developed for Epinephrine detection based on the state-of-art of molecular imprinting technique over an optical fiber. The optical absorption concept of the LMR-based sensor is proofed by incorporating an amino silane-functionaliz ...
Read MoreHoorieh Fallah, Tannaz Asadishad, Gholam M Parsanasab, Sulaiman Wadi Harun, Waleed S Mohammed, Moh Yasin - Dec. 30, 2021
In this study, Zinc oxide (ZnO) nanorods based fiber optic biosensor has been reported for rapid and sensitive detection of Escherichia Coli (E-coli). A thin layer of Gold nanoparticles (Au)(around 50 nm) is coated on the tip of a multimode plastic optical fiber. ZnO Nanorods are grown on Au layer t ...
Read MorePeyman Malekzadeh, Gholam-Mohammad Parsanasab, Hamed Nikbakht, Ezeddin Mohajerani, Majid Taghavi, Hamid Latifi - May 15, 2021
In this paper, a novel method has been proposed for increasing the extinction ratio of a plasmonic waveguide polarizer. Aluminum was coated in a 20-micron multi-strip pattern on the top of a SU-8 waveguide to excite the surface plasmons. The simulation and experimental results showed that the extinc ...
Read MoreMajid Taghavi, Hamid Latifi, Gholam Mohammad Parsanasab, Abolfazl Abedi, Hamed Nikbakht, Mohammad Hosein Poorghadiri - April 9, 2021
This paper is a report on the design and fabrication of a dual-axis micro-opto-electro-mechanical system (MOEMS) accelerometer. The device consists of a proof mass (PM) suspended by four L-shaped springs. Two Fabry-Pérot (FP) cavities are formed between the cross-sections of the PM and the ends of t ...
Read MorePeyman Malekzadeh, Gholam mohamad Parsanasab, Ezzedin Mohajerani - Feb. 1, 2020
In this paper we emphasize on importance of optical integrated circuit in technology and material that used in fabrication of them. We also study the fabrication of polymeric waveguides with SU8 -2002.this material is a negative photoresist which changes from monomer to polymer by UV lithography and ...
Read MoreHamed Nikbakht, Hamid Latifi, Gholam-Mohammad Parsanasab, Majid Taghavi, Maryam Riyahi - Aug. 27, 2019
High refractive index (RI) thin films are capable of pulling waveguide mode profiles towards themselves. In this study, it is shown that by applying high RI coatings with specific thicknesses on the side of optical waveguides, significantly different mode profiles for orthogonal polarizations can be ...
Read MoreMarzieh Saffari, Asghar Gholami, Gholam-Mohammad Parsanasab, Zaker Hossein Firouzeh - July 1, 2019
A high-power narrow-linewidth low-threshold single-mode microsphere laser is investigated by coupling an undoped microsphere with a different size to a single-microsphere laser. A model is proposed for microsphere lasers and it is verified by comparing its results to the experimental results publish ...
Read MoreGholam-Mohammad Parsanasab, Peymaneh Rafieipour, Abbas Ghasempour Ardakani - May 29, 2019
The demand for improving dyeing efficiency and photochemical/photo-physical properties of organic-dyes-based random lasers while focusing on eco-friendly procedures, cost effective production and reduced toxicity has been grown for the past few years. In order to fulfill these requirements, an organ ...
Read MoreG. M. Parsanasab K. Ahmadi, A. Zakery - May 6, 2019
In this study, the effect of As2S3 waveguide layer on propagation gain for Er:Ti:LiNbO3 ridge waveguide amplifiers is investigated. In comparison with a typical titanium in-diffused channel waveguide, the three side Erbium in-diffusion of a 6 μm wide ridge waveguide and the better light confinement ...
Read MoreMajid Taghavi, Hamid Latifi, Gholam Mohammad Parsanasab, Abolfazl Abedi, Hamed Nikbakht, Mohammad Javad Sharifi - May 1, 2019
This paper presents the design, fabrication, and characterization of a SU-8 four L-shaped beams optical micro-electro-mechanical-system accelerometer based on a Fabry–Pérot (FP) interferometer. An applied acceleration causes a displacement of the proof mass and changes the cavity of FP resonator. Fa ...
Read MoreShadi Asgari, Gholam Ali Koohmareh, Gholam Mohammad Parsanasab - May 7, 2017
The paper presents the synthesis of a series of polyesters containing nitro-substituted phenyl azothiazole, azobenzothiazole and azobenzene chromophores and their characterization by 1H NMR, FTIR and UV–Vis spectroscopy. Also the solubility, glass transition temperatures, thermal stability of the sy ...
Read MoreGholam-Mohammad Parsanasab, Mojtaba Moshkani, Alireza Gharavi - April 6, 2015
We have demonstrated an optically pumped polymer microring laser fabricated by two photon polymerization (TPP) of SU-8. The gain medium is an organic dye (Rhodamine B) doped in SU-8, and the laser cavity is a double coupled microring structure. Single mode lasing was obtained from the two coupled ri ...
Read MoreParvin Sorayaie, Mohammad-Hasan Yusefi, Hamid-Reza Fallah, Gholam-Mohammad Parsanasab - Nov. 18, 2014
In this paper, the growths of ZnO nano- and microstructures by VLS mechanism have been studied. A piece of silica fiber (SMF-28 optical fiber) was used as a substrate. By controlling the experimental conditions, nano- and microstructures of ZnO with different shapes and sizes were grown around the o ...
Read MoreAlireza Gharavi Khadije Miar-Abas-Kiani , Gholam-Mohamad Parsanasab - Feb. 8, 2013
We have fabricated a refractive-index-tapered waveguide by exposing an azo polymer film to a 532-nm wavelength laser beam focused to about 60-μm spot size at the film with no surface deformation. The converging ability of the taper (ability to increase intensity along the taper) was measured to be 5 ...
Read MoreGholam-Mohammad Parsanasab, Mohammad Taghi Sharbati, Hamid Reza Karimi-Alavijeh, Soheil Soltani, Alireza Gharavi - Aug. 1, 2011
An all-optical switch was fabricated using azo polymers in a directional coupler form where the index of the coupling region was change via cis-trans of azo dyes in the polymer matrix. Exposing the coupling region to green or violet light caused switching action with a response time of about 10 s. ...
Read MoreHamidreza Karimi-Alavijeh, Gholam-Mohammad Parsanasab, Mohammad-Amin Baghban, Alireza Gharavi - June 10, 2009
We have fabricated a two-dimensional photonic crystal that functions as a two-channel add/drop filter on azo-functionalized polymeric films using a fast, direct-writing method. By properly adjusting the resonance, this structure can be used as a multichannel add/drop filter in the plane of the film. ...
Read MoreHamidreza Karimi-Alavijeh, Mohammad-Amin Baghban, Gholam-Mohammad Parsanasab, Edris Sarailou, Alireza Gharavi, Sirus Javadpour - Sept. 15, 2008
We have fabricated in-plane slanted gratings on azo-functionalized polymeric films using a fast, direct-writing method. By properly adjusting the resonance, these gratings can be used as 90° integrated reflectors and add/drop filters in the plane of the film. We have produced an attenuation of 14.8 ...
Read MoreH Karimi-Alavijeh, M-A Baghban, G-M Parsanasab, A Gharavi, S Javadpour - Aug. 27, 2008
We have fabricated a 2-D photonic crystal which functions as a two-channel add/drop filter on azo-functionalized polymeric films using a fast, direct-writing method. By properly adjusting the resonance, this structure can be used as a multi-channel add/drop filter in the plane of the film. Here, we ...
Read MoreHamidreza Karimi–Alavijeh, Gholam-Mohammad Parsanasab, Mohammad-Amin Baghban, Edris Sarailou, Alireza Gharavi, Sirus Javadpour, Vladimir Shkunov - Jan. 28, 2008
ast direct writing of waveguides on polymers using low power continuous-wave lasers has been investigated. Using the cis-trans property of a functionalized sulfonated azo chromophores, we have fabricated graded index waveguides with low loss, which is due to graded index sidewalls. Fabrication is do ...
Read MoreAlireza Kavousi, Fatemeh Moradiani, Gholam Mohammad Parsanasab - Jan. 20, 2023
In this paper, we report the fabrication and characterization of two concentric microring polymer lasers. The experimental results of this laser have been compared with single microring lasers. Experimental results have illustrated that the proposed structure removes all the side modes of the single ...
Read MorePegah Aivazy Arvanagh, Fatemeh Moradiani, Gholam-mohammad Parsanasab, Mohammad Talebi Khoshmehr - Feb. 13, 2022
Here, the experimental performance of optically-pumped polymer micro-ring laser fabricated by the direct writing method of SU-8 is reported. Then the effect size of outside unwanted particles (OUP) is investigated on the sample. It has been shown when the size of OUPs are very small, the amplitude o ...
Read MoreMohsen Mirmohammadi, Gholam mohammad Parsanasab, Mohammad Talebi khoshmehr - Feb. 1, 2022
Abstract- In this paper we described the importance, propagation method and some specification of optical waveguides. In the following, profits and important feature of polymeric waveguides were explained. Then, fabrication process of kind of polymeric waveguide with SU8 which is a negative photo ...
Read MoreGholam mohammad Parsanasab, Majid Taghavi, Samaneh Mostajeran - Feb. 1, 2020
In this study, we first investigated the feasibility of a solution made of different types of chalcogenide powders and concluded that only amorphous chalcogenides could provide a suitable solution for spin-coated deposition. After repeating the experiments, we found that when we heat them in order t ...
Read MoreMohammad Talebi khoshmehr, Gholam mohammad Parsanasab, Reza Gholamzadeh, Hamid Ghomi - Feb. 1, 2020
In this paper Fabrication and characterization of bottle-like microcavity laser are reported. The active medium of this laser is Rhodamine (R6G) dye solved in Su-8 solvent that put around the optical fiber like a bottle. These lasers free space pumped with second harmonic Nd: YAG pulsed laser and ou ...
Read MoreKeyvan Ahmadi, Gholam moammad Parsanasab, MohammadHossein Fathi, Mehdi Amini, Abdolnasser Zakeri - Feb. 1, 2017
In this paper bragg grating writing required for integrated lasers on single mode channel LiNbO3:Ti:Fe waveguide at 1550nm using a two beam setup has been demonstrated and it has been simultaneously shown on an optical spectrum analyzer(OSA ) how 1550nm wavelength from a broadband ASE source is bein ...
Read MoreShadi Asgari, Gholami Koohmareh, Gholam Mohammad Parsanasab - Oct. 6, 2014
A nonlinear optical (NLO) active thiazole chromophore was synthesized and condensed with 2, 6-pyridine dicarboxylic acid and 4-aryl-2, 6-bis (4-carboxyphenyl) pyridine to yield a series of polyesters. Molecular structural characterization of the resulting chromophores and polyesters was achieved by ...
Read MoreJaleh Sadeghi, Gholam Ali Koohmareh, Gholam Mohammad Parsanasab - Oct. 6, 2014
In this study, a nonlinear optical (NLO) chromophore based on 4-amino benzonitrile and m-phenylene diamine was synthesized and it was then used for chromophore functionalized polyimides. All of the compounds, including chromophore and polymer were characterized using FTIR and HNMR spectroscopies. ...
Read MoreGholam Mohammad Parsanasab, Gholam Ali Koohmareh, Jaleh Sadeghi - Oct. 6, 2014
In this study, a new thermally-stable second-order nonlinear optical polyimide with side-chain second-order nonlinear optical (NLO) chromophore was synthesized. A functionalized azo chromophore was first synthesized and then the novel polyimide was synthesized from a hydroxyl containing polyimide, f ...
Read MoreShadi Asgari, Golam Ali Koohmareh, Golam Mohammad Parsanasab - Oct. 6, 2014
A series of second-order nonlinear polyesters with azobenzene units in side-chain was synthesized. First a azo chromophore was synthesized and then polymerized by reaction with 2, 6-pyridine dicarboxylic acid and 4-aryl-2, 6-bis (4-carboxyphenyl) pyridine. Molecular structural characterization of th ...
Read MoreJaleh Sadeghi, Gholamali Koohmareh, Gholam Mohammad Parsanasab - Jan. 1, 2014
In this study, a new thermally-stable second-order nonlinear optical polyimide with side-chain second-order nonlinear optical (NLO) chromophore was synthesized. A functionalized azo chromophore was first synthesized and then the novel polyimide was synthesized from a hydroxyl containing polyimide, f ...
Read MoreA Gharavi, H Karimi-Alavijeh, E Sarailou, M–A Baghban, G–M Parsanasab - Feb. 10, 2008
In this paper, we have reported the fabrication of two-dimensional photonic crystals, using a direct writing method in azo polymers. Periodic structures have been fabricated using the interference patterns of two coherent laser beams. The frequency response of the initial one-dimensional structure s ...
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