Enhanced wavelength sensitivity of the self-collimation superprism effect in photonic crystals via slow light

Li, Wei; Zhang, Xiaogang; Lin, Xulin; Jiang, Xunya

doi:10.1364/ol.39.004486

Cited by 29 publications

(11 citation statements)

References 20 publications

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“…4(b), which is critically important for Wavelength Demultiplexing (WDM) applications in optical communications. 19 All the discussed performance analyses are presented in Table I. Taking all these results into consideration, although the best results are not being obtained for some parameters, the overall results in the present work are better.…”

mentioning

confidence: 65%

Enhanced superprism effect in symmetry reduced photonic crystals

Gümüş

Giden

Akçaalan

et al. 2018

Applied Physics Letters

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We propose compact S-vector superprism providing broadband wavelength sensitivity within a/λ = 0.610–0.635, where “a” is the lattice constant, λ is the incident wavelength, and S denotes the Poynting vector. The reported configuration overcomes strong beam divergence and complex beam generation due to the self-collimation ability of the low symmetric primitive photonic crystal (PhC) cells. Analytical calculations of equi-frequency contours, photonic band structures, and group velocity dispersions are performed by solving Maxwell's equations and using the plane wave expansion method. Besides, finite-difference time-domain analyses are also conducted. The designed superprism induces large refracted angle variation for different frequencies when the incident angle is fixed: 4% change of incident frequencies results in approximately 40° deflected angle difference with a maximum 68.9° deflection angle inside the PhC. Meanwhile, for a fixed incident wavelength, a large output variation occurs if the incident angle is altered. Microwave experimental results are found to be in good agreement with the numerical analyses.

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confidence: 65%

Enhanced superprism effect in symmetry reduced photonic crystals

Gümüş

Giden

Akçaalan

et al. 2018

Applied Physics Letters

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“…Hence, ideal SC in the sensing area is out of the scope of this article. [ 40,41 ] In other words, severe EFC changes as a result of index change in the voids are desired. Second, to provide light propagation in a channel‐less background, SC property must be obtained in the square array platform.…”

Section: The Proposed Structurementioning

confidence: 99%

“…To provide better light coupling from the square array to hexagonal structure and vice versa, the EFCs in the hexagonal lattice are required to match the EFCs of the square array at identical wavelengths, however, flat EFCs are not desired for the sensing applications. [ 40,41 ] Hence in the next step, the group indices have been analysed for the detection area for diverse radii of holes in the range of 0.15 to 0.35a h with the increment step of Δ r h = 0.05a h for the first 3 bands for TE and TM polarizations. Smaller and larger voids other than the proposed radii size have not been considered here, due to challenges in infiltration and fabrication processes, respectively.…”

Section: Efcs and Band Structure Analysismentioning

confidence: 99%

Self‐Collimation and Slow Light‐Based Refractive Index Sensor with a Large Detection Range

2021

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In this study, a refractive index sensor based on self‐collimation and slow light is presented which operates in the Mid‐IR range (4 µm < λ < 4.133 µm). Here, the square and hexagonal arrays are merged as the background platform and the sensing area, respectively to provide self‐collimation and slow light properties. Three sensors based on slow‐light and self‐collimation are presented in detail which provide Q‐factor, sensitivity, and detection range of 227, 104 nm RIU−1, and 1–1.7, respectively in the best case. Furthermore, the sensor design based on self‐collimation and photonic bandgap phenomena in the background platform and the sensing area, respectively is presented with a single detection unit. The presented sensors are capable of gas or liquid detection with refractive indices in the range of 1–2 with enhanced Q‐factor and sensitivity of over 620 and 123, respectively.

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“…When SC effects have low group velocities, they can be utilized as high quality-factor (Q-factor) waveguides and cavities. Usually, low group velocity brings high tunability, as well as effective modulation of the beam behavior of PhCs [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Self-Collimation Effect in Photonic Crystal Membranes Using Hyperbolic Metamaterials

et al. 2022

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Hyperbolic metamaterials (HMMs) exhibit high tunability in photonic devices. This study numerically investigates light propagation in photonic crystal (PhC) membranes containing HMMs. The proposed HMM PhC membranes contain square HMM rods, which comprise dielectric (Si) and metallic (Ag) layers. Owing to their property of subwavelength field localization, HMMs can be applied to PhCs to improve tunability and thus enhance the self-collimation (SC) effect of PhCs. The SC points were obtained in the second HMM PhC band, wherein the nearby dispersion curves change significantly. In addition, the effect of the HMM filling factor (i.e., the ratio of the metal-layer to unit-cell thicknesses) on the SC point frequency is studied. Finally, we demonstrate the efficient control of beam behaviors using HMM PhC membranes while considering the nonlinearity of Ag. The findings of this study confirm that high-performance HMM PhC membranes can be employed in nonlinear all-optical switches, filters, tunable lenses, and other integrated optical devices.

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Enhanced wavelength sensitivity of the self-collimation superprism effect in photonic crystals via slow light

Cited by 29 publications

References 20 publications

Enhanced superprism effect in symmetry reduced photonic crystals

Enhanced superprism effect in symmetry reduced photonic crystals

Self‐Collimation and Slow Light‐Based Refractive Index Sensor with a Large Detection Range

Enhancement of Self-Collimation Effect in Photonic Crystal Membranes Using Hyperbolic Metamaterials

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