Optical properties of a defective one-dimensional photonic crystal containing graphene nanaolayers

Entezar, Samad Roshan; Saleki, Ziba; Madani, Amir

doi:10.1016/j.physb.2015.09.014

Cited by 41 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2(a)). The first gap (around 1 THz) is a GIPBG [26] which is created due to the joint contribution of graphene conductance and Bragg scatterings of the dielectric stack and the second gap (around 5 THz) is a conventional Bragg gap. As one can see the position and width of the band gaps are substantially modified by increasing the incident angle θ.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the authors proposed a defective 1D PC containing graphene nano-layers which could be used as a tunable narrowband THz filter [26]. In the mentioned paper, some interesting peculiarities of the defect modes are investigated and it is shown that the structure can support a defect mode at the graphene induced PBG for wide defect layers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Broadband Terahertz Polarizing Beam Splitter Based on a Graphene-Based Defective One-Dimensional Photonic Crystal

2019

View full text Add to dashboard Cite

Seeking operative terahertz (THz) devices has always stimulated considerable attention. Of particular interest is the THz beam splitter. Here, a tunable THz polarizing beam splitter (PBS) is proposed based on a graphene-embedded quarter-wave stack with a central defect layer of air. The spectral performance of the structure is investigated by the transfer matrix method. It is found that the electromagnetic waves can be decomposed into two separate polarized waves at incident angles greater than the critical angle. Furthermore, it is shown that a new kind of Brewster angle is found at the low THz frequencies due to the existence of the graphene nano-layers. The appearance of this angle which we call it the graphene induced Brewster angle results in the separation of TM-and TE-polarized waves at the low THz frequencies (f < 2 THz) in addition to the high THz region. It is shown that the working frequency range of PBS can be easily tuned by adjusting the width of the defect layer of air and also by tuning the chemical potential of graphene nano-layers via a gate voltage. The analysis of the proposed PBS is confirmed by the Finite Element Method (FEM) simulations that were performed with the commercial software COMSOL 5.2. Our investigations also reveal that the high transmission extinction ratio (> 200 dB) for TM waves with frequency f < 2 THz is achieved by increasing the chemical potential to 0.5 eV. Moreover, this structure can exhibit extremely high extinction ratio for TE waves with high THz frequencies. Finally, the degree of polarization equals to one is reported for the PBS proposed here. This structure offers the opportunity to realize a high-efficiency PBS with very high extinction ratios at the broadband THz frequency.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Broadband Terahertz Polarizing Beam Splitter Based on a Graphene-Based Defective One-Dimensional Photonic Crystal

2019

View full text Add to dashboard Cite

show abstract

“…In this work, the behavior of 1D-PC radiation will be assessed through the Transfer Matrix Method (TMM) [23,24]. Cancer and normal cells are infiltrated into the cavity covered with graphene sheets to increase the sensitivity of the biosensor due to its high-energy transfer efficiency [25][26][27][28]. Biosensor sensitivity is optimized through the modification of parameters such as radiation incidence angle and cavity thickness.…”

Section: Introductionmentioning

confidence: 99%

Enhanced the sensitivity of one-dimensional photonic crystals infiltrated with cancer cells

Segovia-Chaves

Trujillo

Trabelsi

2023

Mater. Res. Express

View full text Add to dashboard Cite

In this work, we use a one-dimensional photonic crystal as a biosensor composed of alternating GaAs and air layers. Within the cavity where they are inﬁltrated, the Normal, Jurkat, HeLa, PC-12, MDA-MB-231, and MCF-7 cells are bounded by layers of nanocomposite and graphene to increase biosensor sensitivity. The transmission spectrum was calculated using the transfer matrix method. We observed that, when the structural periodicity is broken, defect modes that characterize each cell are created. These defect modes move at a wavelength as the dielectric constant increases. Additionally, the separation between defect modes and bandwidthdetermines sensitivity, Q factor, and FOM, in which average values of 406.84 nm/RIU,1765.53, and 535.44 were obtained, respectively, for normal light incidence. RegardingTransverse-Electric (TE) and Transverse-Magnetic (TM) polarization, the defectmodes shift toward shorter wavelengths as the angle of incidence increases. For TEpolarization, transmittance decreased and the distance between the modes increased.At a 50° angle, sensitivity, Q factor, and FOM increased up to 497.55 nm/RIU, 3182.02,and 1401.25, respectively. Conversely, at a 50° angle in TM polarization, sensitivityremained constant at a value of 407 nm/RIU, along with increased transmittanceand decreased performance. Finally, sensitivity and performance were optimized bymodifying the cavity thickness value at an incidence angle of 30° ° for TE polarization,for TM polarization. In both cases, the increased and at an incidence angle of 10

show abstract

“…This phenomenon makes defective PCs attractive for various technology applications, such as the design of narrowband transmission filters [28], low threshold lasers [29], and optical communication technologies. Quite recently, the authors proposed a defective 1D PC containing graphene nanolayers which could be used as a tunable narrowband THz filter [30]. In the mentioned paper, some interesting peculiarities of the defect modes are investigated and it is shown that the structure can support a defect mode at the grapheneinduced PBG for very wide defect layers.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of a one-dimensional photonic crystal containing a graphene-based hyperbolic metamaterial defect layer

2017

View full text Add to dashboard Cite

The transmission properties of a one-dimensional defective photonic crystal have been investigated using the transfer matrix method. A layer of graphene-based hyperbolic metamaterial whose optical axis is tilted with respect to the interface is taken as a defect. It is shown that two kinds of the defect modes can be found in the band gaps of the structure for TM-polarized waves. One kind is created at the frequency range in which the principle elements of the effective permittivity tensor of the defect layer have the same signs. The frequency of this kind of defect mode is independent from the orientation of the optical axis of the defect layer. The other one is created at the hyperbolic dispersion frequency range. Such a defect mode appears due to the anisotropic behavior of the defect layer and its frequency strongly depends on the orientation of the optical axis. Unlike the conventional defect modes, the magnetic field of this defect mode is localized around the defect layer.

show abstract

Optical properties of a defective one-dimensional photonic crystal containing graphene nanaolayers

Cited by 41 publications

References 33 publications

Broadband Terahertz Polarizing Beam Splitter Based on a Graphene-Based Defective One-Dimensional Photonic Crystal

Broadband Terahertz Polarizing Beam Splitter Based on a Graphene-Based Defective One-Dimensional Photonic Crystal

Enhanced the sensitivity of one-dimensional photonic crystals infiltrated with cancer cells

Optical properties of a one-dimensional photonic crystal containing a graphene-based hyperbolic metamaterial defect layer

Contact Info

Product

Resources

About