Achieving wideband polarization-independent anomalous reflection for linearly polarized waves with dispersionless phase gradient metasurfaces

Li, Yongfeng; Zhang, Jieqiu; Qu, Shaobo; Wang, Jiafu; Chen, Hongya; Zheng, Lin; Xu, Zhuo; Zhang, Anxue

doi:10.1088/0022-3727/47/42/425103

Cited by 55 publications

(34 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite the increased efficiency for transmission, the diffraction efficiency could be even more fully optimized in reflection by including a metal substrate under functional structures. The metal substrate here usually serves as a reflector to reflect light to further couple with the functional structure, exhibiting the same inference mechanism as described above . However, when the spacer between the structure and the metal substrate d narrows (e.g., d = λ eff /10, where λ eff is the effective wavelength in the spacer), another factor, called the gap‐plasmon, must be taken into account because the coupling between the structure and the metal becomes influential .…”

Section: Major Improvements In Function and Efficiencymentioning

confidence: 99%

Emergent Functionality and Controllability in Few‐Layer Metasurfaces

et al. 2015

View full text Add to dashboard Cite

Recent progress in metamaterial research has successfully exceeded the limitations imposed by conventional materials and optical devices, enabling the manipulation of electromagnetic waves as desired. The distinct characteristics and controlling abilities of metamaterials make them ideal candidates for novel photonics devices not only in traditional optics but also for biological detection, medical science, and metrology. However, the controllability and functionality of both single-layer metasurfaces and bulk metamaterials are not sufficient to meet the requirements of emerging technologies; hence, new solutions must be found. As such technologies advance, new functionalities will emerge as different or identical single-layer metasurfaces are combined. Thus, innovation in few-layer metasurfaces will become an increasingly important line of research. Here, these metasurfaces are classified according to their functionalities and the few-layer metasurfaces that have been proposed up to now are presented in a clear sequence. It is expected that, with further development in this area, few-layer metasurfaces will play an important role in the family of optical materials.

show abstract

Section: Major Improvements In Function and Efficiencymentioning

confidence: 99%

Emergent Functionality and Controllability in Few‐Layer Metasurfaces

et al. 2015

View full text Add to dashboard Cite

show abstract

“…All these features suggest that the symmetrical and asymmetrical meta-atoms share the same working mechanism right at the center working frequency, although the routes on which they approach the criterion (Equation ( 3) ) are different. Such new structures add many new possibilities [ 29 ] and freedoms to the family of meta-atoms that can realize the 100%-effi ciency PSHE, which are very helpful for researchers to fl exibly design their own systems and realize certain effects unique to asymmetrical structures. Having obtained two practical designs for meta-atoms, we now fabricate the corresponding meta-surfaces ( Figure 4 a,e) according to the scheme described in Figure 1 c and then verify their abilities to achieve the PSHE with nearly 100% effi ciency.…”

Section: ε =mentioning

confidence: 99%

Photonic Spin Hall Effect with Nearly 100% Efficiency

Luo

Xiao

et al. 2015

Advanced Optical Materials

272

234

View full text Add to dashboard Cite

geometrical-optics theory. [ 7 ] Although the intrinsic PSHE was found signifi cantly enhanced by the (spin-independent) phase gradients at carefully designed meta-surfaces (artifi cial ultra-thin metamaterials composed by planar units with tailored properties exhibiting extraordinary capabilities to control light propagations), [8][9][10][11][12][13][14][15][16][17] the measured ratio between the transverse displacement of spin-polarized photons and their traveling distance is still very small (≈10 −2 ). [ 12 ] In a parallel line, strong PSHE was discovered at a particular class of meta-surfaces that can scatter spin-polarized lights to different directions, [13][14][15][16] which is analogous to the extrinsic SHE discovered in electron systems. [ 3 ] The PSHE of this type can be very pronounced because the "transverse forces" acting on the spin-polarized photons come from the (spindependent) phase gradient (comparable to the wave vector of light in vacuum) on the meta-surface, which is realized at subwavelength scales in a fully controllable manner. [13][14][15][16] In sharp contrast to the intrinsic PSHE for which a semi-geometrical-optics theory is suffi cient, [ 12 ] the extrinsic PSHE can only be understood based on the full-wave Maxwell equations where wave interferences play very important roles. [13][14][15][16] However, wave interferences can also form unwanted zero-order modes after scatterings by meta-surfaces, so that the devices realized so far all suffer loweffi ciency problem: typically only a small portion (theoretical limit 25%) of incident spin-polarized photons can be anomalously defl ected by the meta-surfaces yielding the PSHE. [ 14,15,18,19 ] Here we show that in principle a giant PSHE with nearly 100% effi ciency can be realized at meta-surfaces satisfying certain criterion, which is derived from a general Jones matrix analysis. Such a criterion is approachable from two different routes, leading to two types of meta-surfaces with distinct symmetry properties. While the idea is realizable at general frequencies, as a proof of concept, here we design and fabricate two realistic microwave samples and perform experiments to demonstrate that both can realize PSHE with ≈90% effi ciency within a broad frequency bandwidth (≈10-14 GHz). Finally, we experimentally demonstrate that our meta-surfaces can work as effi cient and broadband polarization detectors as one illustration of many potential applications of our fi ndings. Results and Discussion Criterion to Realize PSHE with 100% Effi ciencyWe start from analyzing the electromagnetic (EM) properties of the building block (meta-atom) of our meta-surfaces. As shown in Figure 1 a, consider a generic slab, representing a 2D array Photonic spin Hall effect (PSHE; i.e., spin-polarized photons can be laterally separated in transportation) gains increasing attention from both science and technology, but available mechanisms either require bulky systems or exhibit very low effi ciencies. Here it is demonstrated that a giant PSHE with ≈100% effi ciency can...

show abstract

“…In recent years, as an important branch of MS, phase gradient metasurface (GMS) with low RCS has been paid great interest due to its tremendous potential in military practice [25][26][27][28]. This kind of MS merely reflects the incident waves into the backward space rather than transforming EM energy into heat, which lowers the probability of MS being detected by infrared devices [29][30][31][32]. GMS can introduce the artificial wave vector at in-plane direction to control the propagation direction of transmitted and reflected wave beams [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Study of Energy Scattering Relation and RCS Reduction Characteristic of Matrix-Type Coding Metasurface

et al. 2018

View full text Add to dashboard Cite

In this paper, we present a design of the linear polarization conversion metasurface (MS) for the broadband radar cross section (RCS) reduction based on split-ring resonator (SRR) structure in microwave region. The corresponding phase gradient can be obtained through the stable phase difference of basic units of polarization conversion MS. The designed polarization conversion MS is applied in coded electromagnetic (EM) matrix by defining two basic units “0” and “1”, respectively. Based on the principle of planar array theory, a new random coding method named by matrix-type coding is proposed. Correlative RCS reduction mechanism is discussed and verified, which can be used to explore the RCS reduction characteristic. The simulated linear polarization conversion rate of the designed structure is up to 90% in the frequency range of 6–15 GHz, and the RCS reduction results verify the theoretical assumptions. Two kinds of matrix-type coding MS samples are prepared and measured. The experimental results indicate that the reflectance of MS is less than –10 dB on average under normal incidence in frequency range of 5.8–15.5 GHz. The average RCS reduction is essentially more than 10 dB in frequency range of 5.5–15 GHz and the corresponding relative bandwidth is 92.7%, which reasonably agrees with simulation. In addition, excellent RCS reduction characteristic of the designed MS can also be achieved over a wide incident angle.

show abstract

Achieving wideband polarization-independent anomalous reflection for linearly polarized waves with dispersionless phase gradient metasurfaces

Cited by 55 publications

References 22 publications

Emergent Functionality and Controllability in Few‐Layer Metasurfaces

Emergent Functionality and Controllability in Few‐Layer Metasurfaces

Photonic Spin Hall Effect with Nearly 100% Efficiency

Study of Energy Scattering Relation and RCS Reduction Characteristic of Matrix-Type Coding Metasurface

Contact Info

Product

Resources

About