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Citations since 2017
14 Research Items
Md Farhad Hassan, a graduate student of the University of Southern California, currently working on flexible and wearable medical devices with a particular interest in printed bioelectronics and biphotonic. Along with biomedical devices, he is developing low-cost, highly scalable, and flexible sensors for structural health monitoring (i.e: Bridge, Buildings). To learn more, please visit www.farhadhassan.com
August 2022 - present
University of Southern California
- Graduate Research Assistant
In this article, a nanoscale refractive index sensor with double rectangular silver slots perpendicularly coupled with a pair of horizontal dielectric-metal-dielectric (DMD) waveguides is proposed. The simulation of the transmission spectra, deploying the finite integration scheme, shows a linear relationship with the refractive index. Parameters o...
To satisfy the requirements of label-free detection, low cost, fast response of a lab-on-chip biosensor, a nanodot enhanced metal-insulator-metal (MIM) waveguide based refractive index sensor coupled with three rectangular cavities, is proposed in this work. Numerical investigation of the transmission spectra, employing the finite element method (F...
This article presents a refractive index (RI) nanosensor utilizing gold as the plasmonic material. The layout of the sensor includes metal-insulator-metal (MIM) waveguides coupled with a cog-shaped resonator studded with gold nanorods. At the mid-infrared (MIR) spectrum, the spectral characteristics of the sensor are numerically analyzed employing...
A plasmonic refractive index sensor focused on a square ring resonator (SRR) and a circular ring resonator (CRR), coupled to a metal-insulator-metal (MIM) bus waveguide and a rectangular stub is proposed. The structure is numerically investigated using the Finite Element Method (FEM) by positioning nanodots (NDs) at highly confined E-filed region....
A refractive index nanosensor with Metal-Insulator-Metal (MIM) waveguide setup, incorporating a concentric triple ring resonator (CTRR), is presented in this article. The proposed sensor identifies unknown materials by exploiting the linear interrelation between the refractive index and the corresponding shift of the resonant wavelength, aided by t...
In this paper, a six cavity-based metal-insulator-metal plasmonic sensor is proposed. The designed sensor can detect six primary colors in the visible wavelength. Moreover, the proposed sensor can also sense the change in the refractive index. An initial sensitivity of 648.41 nm/RIU and figure of merit of (FOM) 141.29 are found based on the transmi...
In this paper, a refractive index sensor based on three circular rings coupled with a straight metal-insulator-metal (MIM) waveguide is presented. At near-infrared (NIR) spectrum, the spectral characteristics of the sensor are extensively analyzed using the finite element method (FEM). Moreover, the refractive index sensing property is comprehensiv...
A highly sensitive sensor focused on two Metal-Insulator-Metal (MIM) waveguides and three quadrilateral cavities sandwiched perpendicularly in between the MIM waveguides is proposed. Fano resonance induced by the coherent superposition of the narrow band spectral response and broadband spectral response, excites the structural transmission characte...
A metal–insulator–metal (MIM) waveguide coupled with two unequal vertical rectangular cavities optimized for high sensitivity is proposed in this study. Due to the interaction of the continuum and the discrete state in the waveguide mode, a Fano like profile is obtained in the transmission spectra, the shift of which is utilized to identify the mat...
This paper presents a refractive index sensor that includes two horizontal MIM (Metal-Insulator-Metal) waveguides coupled with a rectangular ohmic cavity and a Concentric Double-Ring Resonator (CDRR). The cavities contain the Material Under Sensing (MUS), while the surrounding area is filled with silver. The designed model is simulated using the Fi...
In this paper, a plasmonic structure consists of Metal-Insulator-Metal (M-I-M) waveguide with two rectangular cavities is presented. To asses the performance as a refractive index sensor, the structure has been simulated using the Finite Element Method (FEM). With the change of the refractive index of the material under sensing (MUS), transmission...
In this paper, a Dielectric-Metal-Dielectric (DMD) plasmonic waveguide coupled with a rectangular slot is proposed and analyzed numerically with the Finite Element Method (FEM) as a refractive index sensor. Different structural parameters are varied to obtain maximum sensitivity of the proposed structure. In this geometry, silver is used as the met...
As we know, different models like Drude, Lorentz-Durde model are used to represent the change of relative permittivity of material for varying frequency.
I would like to know, for silver (Ag) which model is most suitable and why? Does the choice of the model depend on the frequency range? What should one consider while selecting the model to predict the change of permittivity with frequency.
I want to make the background of my CST microwave studio as pure white color. Can anyone please suggest me.
Developing highly sensitive, novel RI sensors for practical applications.
Designing a refractive index sensor having high sensitivity which will be suited for the application of on-chip optical sensors.