Tunable photonic crystal wavelength sampler with response in terahertz frequency range

Razi, Sepehr; Ghasemi, Fatemeh

doi:10.1007/s11082-019-1821-0

Cited by 21 publications

(8 citation statements)

References 49 publications

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“…Also, Bloch theory is considered as the most suitable theoretical methodology to evaluate the propagation of an electromagnetic wave through a multilayer structure. According to this theory and for the crystal made of N periods of alternating A and B layers: (AB) N and when the light incident angle is θ, the dispersion relation is [28]:…”

Section: Theoretical Modellingmentioning

confidence: 99%

“…In order to extract the optical features of multilayer structures (such as PCs) in detail, an approach called as transfer matrix method (TMM) has been suggested extensively [28,29]. In this method which is based on Maxwell theory, many important physical phenomena such as multiple reflections from interfaces and the polarization state of the incident wave are considered in a simplified way and that is why more attention has been paid to it compared to the other complicated algorithms.…”

Section: Theoretical Modellingmentioning

confidence: 99%

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Single-step detection of toxic airborne metallic nanoparticles using Goos–Hänchen effect in photonic Bragg grating structures

Ghasemi,

Adinehpour,

Razi

2023

Phys. Scr.

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A real-time photonic crystal sensor is suggested for the detection of airborne heavy metal nanoparticles (HMNPs). The sensor consists of a sandwiched sampling cell between two stacks of alternating TiO2 and Si₋Ge layers, forming the core of the device. The sensor's performance is based on monitoring changes in both the intensity and phase of a probe beam as it propagates through the core. By analyzing the fluctuations in intensity, central frequency, and full width at half maximum (FWHM) of the resonant mode within the transmittance spectrum bandgap, or by monitoring the phase changes at the angle of maximum transmittance that may result in a remarkable Goos–Hänchen (GH) shift in transmittance, the sensor can identify the pollutant nanoparticles. Tuning the thicknesses of the slabs and the number of unit cells in the photonic crystal can dynamically shift the resonant mode and bandgap edges, allowing for easy adjustment of the sensor's responsivity. Furthermore, the optical response of the sensor can be tuned through external parameters such as the incident angle of the probe light or an externally applied electric field. Additionally, the sensor exhibits sensitivity not only to changes in the extent of the sample but also to the shape of the present HMNPs. These characteristics make the proposed configuration cost-effective, user-friendly, and suitable for HMNPs detection without the need for complex sample preparation, data analyses or additional tools/accessories.

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Section: Theoretical Modellingmentioning

confidence: 99%

Section: Theoretical Modellingmentioning

confidence: 99%

Single-step detection of toxic airborne metallic nanoparticles using Goos–Hänchen effect in photonic Bragg grating structures

Ghasemi,

Adinehpour,

Razi

2023

Phys. Scr.

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“…Additionally, taking all of the boundary conditions into consideration, as well as the necessary continuity for tangential components of the fields across the consecutive adjacent layers, it is possible to calculate the coefficients of the related phasors in the extracted formulas [36,37]. Two components of the EMW, at the input and output interfaces of each layer, could be connected by a 2 × 2 transfer matrix for isotropic layers, by taking the dynamical and propagation matrices for each layer into concentration [38][39][40]. Thus, the tangential components of the electric and magnetic fields at the incident and exit end of the total crystal could be related to the product of the transfer matrices of different layers, i.e., for an ideal crystal made of the N periods of a unit-cell we have:…”

Section: Theoretical Approachmentioning

confidence: 99%

Novel Photonic Bio-Chip Sensor Based on Strained Graphene Sheets for Blood Cell Sorting

Ghasemi

Razi

2021

Molecules

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A photonic biochip with a tunable response in the visible range is suggested for blood cell sorting applications. Multi-layers of ZnS and Ge slabs (as the main building blocks), hosting a cell in which bio-sample could be injected, are considered as the core of the sensor. In order to increase the sensitivity of the chip, the bio-cell is capsulated inside air slabs, and its walls are coated with graphene sheets. Paying special attention to white and red blood components, the optimum values for structural parameters are extracted first. Tunability of the sensor detectivity is then explored by finding the role of the probe light incident angle, as well as its polarization. The strain of the graphene layer and angle in which it is applied are also suggested to further improve the performance tunability. Results reflect that the biochip can effectively identify selected components through their induced different optical features, besides of the different figure of merit and sensitivity amounts that are recorded for them by the sensor.

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“…[8][9][10][11][12][13] They have been widely proposed in fabrications of not only light sources such as lasers/diodes [14,15] but also detectors and transducers, [15] all optical filters, mirrors, and switches. [16][17][18][19][20][21][22][23][24][25][26] Nevertheless, these structures are still on tops of attention for new photonic elements design due to their unique characteristics. Valuable experimental techniques including chemical/optical methods and various deposition approaches are also suggested for their fabrication.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional structure made of periodic slabs of SiO₂/InSb offering tunable wide band gap at terahertz frequency range

Razi

Ghasemi

2019

Chinese Phys. B

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Optical features of a semiconductor–dielectric photonic crystal are studied theoretically. Alternating layers of micrometer sized SiO2/InSb slabs are considered as building blocks of the proposed ideal crystal. By inserting additional layers and disrupting the regularity, two more defective crystals are also proposed. Photonic band structure of the ideal crystal and its dependence on the structural parameters are explored at the first step. Transmittance of the defective crystals and its changes with the thicknesses of the layers are studied. After extracting the optimum values for the thicknesses of the unit cells of the crystals, the optical response of the proposed structures at different temperatures and incident angles are investigated. Changes of the defect layers’ induced mode(s) are discussed by taking into consideration of the temperature dependence of the InSb layer permittivity. The results clearly reflect the high potential of the proposed crystals to be used at high temperature terahertz technology as a promising alternative to their electronic counterparts.

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Tunable photonic crystal wavelength sampler with response in terahertz frequency range

Cited by 21 publications

References 49 publications

Single-step detection of toxic airborne metallic nanoparticles using Goos–Hänchen effect in photonic Bragg grating structures

Single-step detection of toxic airborne metallic nanoparticles using Goos–Hänchen effect in photonic Bragg grating structures

Novel Photonic Bio-Chip Sensor Based on Strained Graphene Sheets for Blood Cell Sorting

One-dimensional structure made of periodic slabs of SiO₂/InSb offering tunable wide band gap at terahertz frequency range

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Tunable photonic crystal wavelength sampler with response in terahertz frequency range

Cited by 21 publications

References 49 publications

Single-step detection of toxic airborne metallic nanoparticles using Goos–Hänchen effect in photonic Bragg grating structures

Single-step detection of toxic airborne metallic nanoparticles using Goos–Hänchen effect in photonic Bragg grating structures

Novel Photonic Bio-Chip Sensor Based on Strained Graphene Sheets for Blood Cell Sorting

One-dimensional structure made of periodic slabs of SiO2/InSb offering tunable wide band gap at terahertz frequency range

Contact Info

Product

Resources

About

One-dimensional structure made of periodic slabs of SiO₂/InSb offering tunable wide band gap at terahertz frequency range