Multifunctional Beam Manipulation at Telecommunication Wavelengths Enabled by an All‐Dielectric Metasurface Doublet

Zhou, Changyi; Lee, Woo‐Bin; Park, Chul‐Soon; Gao, Song; Choi, Duk‐Yong

doi:10.1002/adom.202000645

Cited by 11 publications

(2 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These spiral fringe patterns may be attributed to the interference between the divergent optical vortex and the incident beam with a large footprint . In light of the issue of low modulation efficiency as in the cases of metasurface devices, − the unmodulated beam may perturb the vortex beam, which will result in a spiral-fringe-shaped vortex beam. , By counting the interference fringes, we confirmed that the generated vortex beam assumed an optical angular momentum l = 5. To explore the polarization dependence of the metasurface, the intensity profiles of the vortex beams were verified for normal incidence.…”

Section: Resultssupporting

confidence: 52%

Metasurface-Incorporated Optofluidic Refractive Index Sensing for Identification of Liquid Chemicals through Vision Intelligence

Kim

Choi

et al. 2023

ACS Photonics

Self Cite

View full text Add to dashboard Cite

Conventional approaches for the identification of liquid chemicals are bulky and harmful to the environment, detect a limited number of chemical species, produce high false alarm rates, or rely on complex/expensive spectrometers. In this study, a spectrometer-free, accurate metasurface-mediated liquid identification scheme was demonstrated based on optofluidic refractive index (RI) sensing in conjunction with vision intelligence algorithms. A metasurface device integrated into an optofluidic channel provides a polarization-independent focused vortex beam at a single wavelength of 1550 nm, which is highly sensitive to liquid chemicals. The beam patterns respond to the RI and transmission of chemicals, and thus effectively serve as their unique optical "fingerprints". To realize vision intelligence, two deep-learning architectures�a convolutional neural network and a vision transformer�were adopted and trained to classify the beam patterns. A variety of liquid chemicals were successfully identified in situ with over 99% accuracy, requiring no spectrometers. The proposed approach is expected to corroborate the feasibility of artificial intelligence-powered detection schemes that can classify at single wavelengths, unlike conventional instrument-intensive techniques that are attentive to entire spectral responses.

show abstract

Section: Resultssupporting

confidence: 52%

Metasurface-Incorporated Optofluidic Refractive Index Sensing for Identification of Liquid Chemicals through Vision Intelligence

Kim

Choi

et al. 2023

ACS Photonics

Self Cite

View full text Add to dashboard Cite

show abstract

“…SiN also suffers from less nonlinear losses with respect to Si [61], which allows waveguide Another method is to enlarge the FOV of PIC-OPA assisted by metasurfaces (named meta-assisted PIC-OPA). As shown in Figure 6b, the metasurface performs like an ultra-thin lens, which can enlarge the beam steering angle θ by M times [47][48][49]. Lee et al proposed and demonstrated a bidirectional grating antenna PIC-OPA integrated with a miniaturized all-dielectric metasurface doublet formed on a glass substrate atop the antenna array.…”

Section: Pic-opamentioning

confidence: 99%

All-Solid-State Beam Steering via Integrated Optical Phased Array Technology

2022

View full text Add to dashboard Cite

Light detection and ranging (LiDAR), combining traditional radar technology with modern laser technology, has much potential for applications in navigation, mapping, and so on. Benefiting from the superior performance, an all-solid-state beam steering realized by integrated optical phased array (OPA) is one of the key components in the LiDAR system. In this review, we first introduce the basic principle of OPA for beam steering. Then, we briefly review the detailed advances of different solutions such as micro-electromechanical system OPA, liquid crystal OPA, and metasurface OPA, where our main focus was on the recent progress of OPA in photonic integrated chips. Finally, we summarize the different solutions and discuss the challenges and perspectives of all-solid-state beam steering for LiDAR.

show abstract

Flat Retroreflector Based on a Metasurface Doublet Enabling Reliable and Angle‐Tolerant Free‐Space Optical Link

Lee

Zhou

et al. 2021

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

networks, [1] augmented/mixed reality, [2] optical sensors, [3] and laser tracking. [4] For free-space optical communications in the case of wireless data transfer between mobile (e.g., aircrafts, ships, and satellites) and stationary terminals, both passive and active modulating retroreflectors have been extensively investigated. [5][6][7][8][9] The wavefront pertaining to geometrical optical devices is mediated by the accumulated phase shift over a relatively long propagation distance. [10,11] Therefore, conventional retroreflectors such as cat's eye and corner-cube types are particularly subject to shortcomings in terms of their bulky size, heavy weight, and nonplanar shape.Metasurfaces, incorporating specifically engineered subwavelength nanostructures, have been prevalently leveraged to tailor the phase, amplitude, polarization, and spectrum of light beams. [12][13][14] Metasurface-based devices based on nanoresonators allow for dispersion characteristics that are dictated mainly by the geometrical parameters and structural arrangement, and they facilitate facile wavefront manipulations unlike conventional geometrical optics-based components. [15][16][17][18][19] Recently, flat retroreflectors (FRRs) based on a singlet metasurface were proposed, providing merits with respect to their miniaturization and integration with other optic/electronic devices. [20,21] However, their limited angles of operation may constitute a concern to be solved. [22] To mitigate this, metasurface doublets (MDs), which are geared to render successive beam manipulations, have been actively studied. [23][24][25][26][27] For example, an MD-based retroreflector that render wide-angle retroreflections at a wavelength of 850 nm was proposed. [25] Compared with an 850-nm wavelength, which is mostly used for imaging and biometrics, [28] a 1550-nm wavelength in the C-band is unequivocally desirable for long-distance optical communications from the perspective of its minimal attenuation in optical fibers, good eye safety, and compatibility with an erbium-doped fiber amplifier (EDFA). [29][30][31] To the best of our knowledge, there has been no report on the demonstration of a metasurface-based retroreflector for implementing free-space optical communications.In this paper, a reliable and highly angle tolerant optical link capitalizing on an MD-based FRR is proposed and demonstrated to operate in the telecommunications regime centered at λ = 1550 nm. The proposed MD incorporates arrayed hydrogenated

show abstract

Multifunctional Beam Manipulation at Telecommunication Wavelengths Enabled by an All‐Dielectric Metasurface Doublet

Cited by 11 publications

References 79 publications

Metasurface-Incorporated Optofluidic Refractive Index Sensing for Identification of Liquid Chemicals through Vision Intelligence

Metasurface-Incorporated Optofluidic Refractive Index Sensing for Identification of Liquid Chemicals through Vision Intelligence

All-Solid-State Beam Steering via Integrated Optical Phased Array Technology

Flat Retroreflector Based on a Metasurface Doublet Enabling Reliable and Angle‐Tolerant Free‐Space Optical Link

Contact Info

Product

Resources

About