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Author

Dan Zhang

Bio: Dan Zhang is an academic researcher from Nanjing Forestry University. The author has contributed to research in topics: Materials science & Photonic crystal. The author has an hindex of 3, co-authored 34 publications receiving 59 citations.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this paper, a sensor based on the located defect mode resonance is proposed, which can be used to simultaneously measure changes in magnetic induction intensity, plasma density, refractive index, and incident light angle.
Abstract: In this study, a sensor based on the located defect mode resonance is proposed, which can be used to simultaneously measure changes in magnetic induction intensity, plasma density, refractive index, and incident light angle. Plasma is introduced as the defect into a one-dimensional periodic structure, exciting the located defect mode resonance. The sensitivity, linear range, and figure of merit of the sensor are investigated using the transfer matrix method. The increase in the number of cycles can be used to improve the quality factor and FOM. We also consider the influence of the loss tangent on the sensor to a certain extent. The one-dimensional layered structure is utilized, which has the merits of small volume and simple manufacture. In addition, compared with the traditional sensors design, which focuses on the improvement of performance parameters, our proposed sensor concentrates on the study of multiple physical quantities. Therefore, we hope that our work can have some application potential in the field of measurement.

23 citations

Journal ArticleDOI
28 Jul 2022
TL;DR: In this article , a one-dimensional magnetized InSb photonic crystals layered topology (PCLT) is proposed to realize the functions of logic OR operation and magnetic field sensing.
Abstract: A one-dimensional magnetized InSb photonic crystals layered topology (PCLT) proposed in this paper can realize the functions of logic OR operation and magnetic field sensing. In the proposed PCLT, under the transverse magnetic polarization, the value and frequency of the absorption peak (AP) can be controlled by the external magnetic fields and has a high-quality factor (Q), thus OR logical operation can be achieved. Additionally, since InSb has a magneto-optical effect under magnetic fields, the parity of the structure of the PCLT which adds InSb as defect layers can be broken. Electromagnetic waves obtain nonreciprocity when propagating in opposite directions within the PCLT, which means that logical operation and magnetic field sensing based on AP can be obtained on the forward and backward scales. For the detection, on the forward scale, optimum performances of Q, sensitivity (S), the figure of merit, and detection limit are 62 372.09, 0.0169 (2πc/d)/T, 4225 T−1, 1.2 × 10−5 T, and for the backward detection, the corresponding values are 63 626.25, 0.0225 (2πc/d)/T, 5200 T−1, 1 × 10−5 T. The designed PCLT is innovative in multi-functional and multi-scale, having certain research value and prospects.

16 citations

Journal ArticleDOI
TL;DR: HFSS software simulations reveal that the proposed CB-CPW wideband antenna design has a semicircle ground structure, transmission line, parasitic ground, CPW, relatively low return loss, broadband effect, and maximum gain in the range of 5 GHz to 6 GHz; the prototype also achieves two and four-beam performance.
Abstract: This paper presents a novel CB-CPW wideband antenna design. HFSS software simulations reveal that the proposed design has a semicircle ground structure, transmission line, parasitic ground, CPW, relatively low return loss, broadband effect of 3.3377 GHz (4.8337 GHz-8.1714 GHz), double beam capability at 5.2 GHz, and four-beam capability at 5.5 GHz (5.8 GHz). It is compact in size at only 40 mm × 40 mm × 1 mm. A prototype of the proposed antenna was fabricated and measured to validate the simulated design; the results show a bandwidth of 3.38 GHz (3.95 GHz-7.33 GHz), relative bandwidth of 74%, and maximum gain of 3.87 dBi in the range of 5 GHz to 6 GHz; the prototype also achieves two and four-beam performance. Its working frequency covers WLAN (5.15 GHz-5.25 GHz and 5.725 GHz-5.825 GHz), radio frequency identification RFID (5.8 GHz), and global microwave internet access WiMAX (5.25 GHz-5.85 GHz) frequency bands.

13 citations

Journal ArticleDOI
TL;DR: A tunable multifunctional modulator of the stacked graphene-based hyperbolic metamaterial (HM) cells is proposed and the dielectric constant and group index of HM are theoretically investigated.
Abstract: A tunable multifunctional modulator of the stacked graphene-based hyperbolic metamaterial (HM) cells is proposed. The dielectric constant and group index of HM are theoretically investigated. The calculated results show that, for the cell structure, a transmission window in the reflection zone (TWRZ) can be obtained at the normal incidence, but all reflections are converted to the transmission when the incident angle is near 82°. Concurrently, a single frequency absorption in the transmission zone (SFATZ) is realized, which can be adjusted by the chemical potential of graphene. For the whole structure composed of cell structures with different chemical potentials, the ultra-wideband absorption and transmission window in the absorption zone (TWAZ) can be achieved, which can work in different frequency bands if the given structural parameters can be tailored. Those computed results can apply for switchable frequency-dependent and angle-dependent reflection-transmission modulations, single frequency and ultra-wideband absorbers, and a logic switch based on the TWAZ.

13 citations

Journal ArticleDOI
TL;DR: The asymmetric optical bistability of one-dimensional photonic crystals based on InSb and nonlinear materials can be applied to multifunctional devices and nonreciprocal optical isolators.
Abstract: In this paper, one-dimensional (1D) photonic crystals (PCs) based on InSb and nonlinear materials are studied using the transmission matrix method. It is found that in the terahertz band, due to the magneto-optical characteristics of InSb, when the incident light propagates through such 1D PCs in two different directions (forward and backward propagation), an asymmetric optical bistable state can be obtained. Propagating from the forward direction, the bistable state is achieved. Spreading from the backward direction, the multistable state can be observed. Compared with the bistable threshold value for the case of forward incidence, the similar value that appeared in the multistable curve is significantly reduced. The polarization-sensitive features of the asymmetric optical bistability of the presented 1D PCs are also investigated under TM waves, which focuses on the tuning effects of incident angle, external magnetic field, temperature, and the thicknesses of the InSb and nonlinear dielectric layers on the asymmetric optical bistability. The results show that when the incident light enters from two different directions, the tailoring effects of the incident angle and thickness of the InSb layer on the bistable state are obviously different, but the tuning influences of the magnetic field, temperature, and the thickness of the nonlinear material layer on the bistable state are similar. The asymmetric optical bistability we made in this paper can be applied to multifunctional devices and nonreciprocal optical isolators.

11 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a structure based on one-dimensional photonic crystals that can be used for both angle sensing and refractive index sensing is proposed, which is achieved by optical Tamm state.
Abstract: In this article, a structure based on one-dimensional photonic crystals that can be used for both angle sensing and refractive index sensing is proposed, which is achieved by optical Tamm state. Under Bragg scattering, its features are investigated by the transfer matrix method. This sensing structure is based on a multi-frequency absorption structure, which can achieve an absorption rate higher than 0.9 for three to four frequency points at the same time. The studied results demonstrate that the absorption peaks of such an absorption structure can be changed from three to four by adjusting the number of periods and silver layer thickness. Absorption peaks can occur red and blue shifts employing tailoring the thickness of defect and the angle of the incident light. By altering the thickness of the defect and the number of periods, the interval between the absorption peaks can be dominated. They are all with high-quality factors and can be used to bring about a high absorption sensor for the refractive index or angle. When it acts as a refractive index sensor, the operating range can cover from 2 to 2.7, whose sensitivity and average figure of merit are 32.3 THz/RIU and 100. If the presented device is used as an angle sensor, those values will become 0.5 THz/degree and 1.2, and its measuring range is from 25° to 70°. It can be said that the emergence of this special sensing structure will be possible to have a broad application prospect in the field of measurement.

58 citations

Journal ArticleDOI
Yi Jin1, Sailing He1
TL;DR: In this paper, a line current is enhanced by choosing appropriately the dimension of a dielectric domain in which the source lies and that of a permeability-near-zero shell.
Abstract: Using some special properties of a permeability-near-zero material, the radiation of a line current is greatly enhanced by choosing appropriately the dimension of a dielectric domain in which the source lies and that of a permeability-near-zero shell. The radiation of the source can also be completely suppressed by adding appropriately another dielectric domain or an arbitrary perfect electric conductor (PEC) inside the shell. Enhanced directive radiation is also demonstrated by adding a PEC substrate.

50 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed both symmetric and asymmetric configurations of 1D defective photonic crystal structures, which are designed with an alternate arrangement of MgF2 and PbS for real-time detection of waterborne bacteria such as Escherichia coli, vibrio cholera and shigella flexneri.
Abstract: We have proposed both symmetric and asymmetric configurations of 1D defective photonic crystal structures, which are designed with an alternate arrangement of MgF2 and PbS for real-time detection of waterborne bacteria such as Escherichia coli, vibrio cholera and shigella flexneri. The transfer matrix method is employed to assay the transmittance and absorption spectrum of the said structures. A substantial shift in position of the resonant peak is noticed, when the defect layer is infiltrated with contaminated water containing different bacteria. The effects of variation in the defect layer thicknesses, angles of incidence and period of the dielectric layer on the sensor performance are thoroughly addressed. An optimum sensitivity of 387.5 nm/RIU, SNR of 79.2, FOM of 1174.24RIU−1, DL of 2.44х10−4RIU and resolution of 0.0881 nm is achieved for asymmetric structure. The aforementioned upshots could open up an avenue for realization of effectual and real-time waterborne bacteria sensor for biophotonics applications.

38 citations

Journal ArticleDOI
TL;DR: In this article, a variation on the resonant peak positions using the analyte defect layer with different refractive indices was obtained, showing that the defect peak of the optimized structure is red-shifted from 2195 to 2322nm when the refractive index of the defect layer changes from 1.3246 to 1.3634.
Abstract: The performance of one-dimensional photonic crystal for plasma cell application is studied theoretically. The geometry of the structure can detect the change in the refractive index of the plasma cells in a sample that infiltrated through the defect layer. We have obtained a variation on the resonant peak positions using the analyte defect layer with different refractive indices. The defect peak of the optimized structure is red-shifted from 2195 to 2322 nm when the refractive index of the defect layer changes from 1.3246 to 1.3634. This indicates a high sensitivity of the device (S = 3300 nm/RIU) as well as a high Q-factor (Q = 103). The proposed sensor has a great potential for biosensing applications and the detection of convalescent plasma.

31 citations