Rummanur Rahad
@bracu.ac.bd
Research Assistant, Optics and Photonics Research Lab
BRAC University
RESEARCH, TEACHING, or OTHER INTERESTS
Electrical and Electronic Engineering
Scopus Publications
Scopus Publications
Rummanur Rahad, Mohammad Ashraful Haque, Mahin Khan Mahadi, Md. Omar Faruque, Sheikh Mohd. Ta-Seen Afrid, Abu S.M. Mohsin, Abdullah Md Nazim Uddin Rahman Niaz, and Rakibul Hasan Sagor
Elsevier BV
Rummanur Rahad, Mohammad Ashraful Haque, Md. Omar Faruque, Abu S. M. Mohsin, Md Sadi Mobassir, and Rakibul Hasan Sagor
Institute of Electrical and Electronics Engineers (IEEE)
Sujoy Mondal, Abu S M Mohsin, Mohammed Belal Hossain Bhuian, Md Mosaddequr Rahman, and Rummanur Rahad
IOP Publishing
Abstract On-chip localized surface plasmon resonance (LSPR) biosensor on chip (BoC) is a type of label-free biosensor that utilizes the plasmonic resonances of metal nanostructures to detect changes in the refractive index of the local environment. This results in changes in the intensity and wavelength of the surface plasmon resonance, which can be used to quantify the presence and concentration of biomolecules such as proteins, nucleic acids, and cells. In this paper, we propose a novel on-chip device with a microfluidic channel that contains the biological fluid under test. We have obtained sharp resonance peaks in the wavelength range between 700–800 nm with a sensitivity of 509 nm R−1IU−1 which is good compared to other on-chip devices. The main advantage of our design is the less complex manufacturing process compared to other BoCs. Our design consists of a central cavity that is surrounded by silver and consists of rectangular pillar-shaped silver particles placed in the cavity. Two very promising applications of this device are label-free temperature sensing and blood hemoglobin (Hb) concentration sensing with a resolution of 0.222 nm/°C for temperature and 1. 34 nm/(g/dL) for Hb. However, it can be used for any kind of sensing application that involves refractive index changes as the sensing platform.
Mohammad Ashraful Haque, Rummanur Rahad, Md. Omar Faruque, Md Sadi Mobassir, and Rakibul Hasan Sagor
Elsevier BV
Rummanur Rahad, Abu S. M. Mohsin, Mohammed Belal Hossain Bhuian, and Md. Mosaddequr Rahman
Institute of Electrical and Electronics Engineers (IEEE)
The advent of graphene has opened new avenues for the design of high-performance metamaterial devices, particularly in the realm of electromagnetic absorption applications. This paper introduces a novel design for a broadband tunable graphene metamaterial absorber (GMMA) utilizing graphene. Through numerical simulations, our proposed GMMA demonstrates an absorption bandwidth of 3 THz (1.14 – 4.14 THz) with absorptivity exceeding 90% for both transverse magnetic (TM) and transverse electric (TE) modes. A comprehensive numerical analysis, using a transmission line equivalent circuit model, has been proposed to find out the impedance components of all the corresponding layers, which can be significant to determine the impedance matching. The absorber exhibits wideband tunability, polarization insensitivity, and robust tolerance to structural variations, making it a promising candidate for diverse applications in the terahertz (THz) band especially in the antenna regime. Our proposed GMMA antenna can achieve a gain of 37.48 dB, a directivity of 32.81 dB, a return loss of -34 dB, and an efficiency of 99.96%. This research provides a valuable contribution to the development of tunable broadband GMMAs for THz frequencies, addressing the increasing demand for high-speed and efficient devices in the modern era of science and technology.
Shadman Shahriar Sharar, Rummanur Rahad, Mohammad Ashraful Haque, and Rakibul Hasan Sagor
Elsevier BV
Mohammad Ashraful Haque, Rummanur Rahad, A.K.M. Rakib, Shadman Shahriar Sharar, and Rakibul Hasan Sagor
Elsevier BV
A. K. M. Rakib, Rummanur Rahad, Md. Omar Faruque, and Rakibul Hasan Sagor
Optica Publishing Group
In this article, we introduce a novel comb shaped plasmonic refractive index sensor that employs a ZrN-Insulator-ZrN configuration. The sensor is constructed using Zirconium Nitride (ZrN), an alternative refractory material that offers advantages over traditional metals such as silver and gold, as ZrN is standard Complementary Metal Oxide Semiconductor (CMOS)-compatible and has tunable optical properties. The sensor has recorded a maximum sensitivity, figure of merit (FOM), and sensing resolution of 1445.46 nm/RIU, 140.96, and 6.91 × 10−7 RIU−1, respectively. Beyond that, the integration of ZrN offers the sensor with various advantages, including higher hardness, thermal stability at high temperatures, better corrosion and abrasion resistance, and lower electrical resistivity, whereas traditional plasmonic metals lack these properties, curtailing the real-world use of plasmonic devices. As a result, our suggested model surpasses the typical noble material based Metal-Insulator-Metal (MIM) arrangement and offers potential for the development of highly efficient, robust, and durable nanometric sensing devices which will create a bridge between nanoelectronics and plasmonics.
Rummanur Rahad, A.K.M. Rakib, Mohammad Ashraful Haque, Shadman Shahriar Sharar, and Rakibul Hasan Sagor
Elsevier BV
Rummanur Rahad, A.K.M. Rakib, Mahin Khan Mahadi, and Md. Omar Faruque
Elsevier BV