Computational inverse design for cascaded systems of metasurface optics

Backer, Adam S.

doi:10.1364/oe.27.030308

Cited by 80 publications

(75 citation statements)

References 92 publications

(118 reference statements)

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“…Besides, cascaded metasurfaces are known to be useful for mitigating chromatic aberration. [ 20,21 ] It is hence asserted the scheme of cascading can be leveraged to control the phase, amplitude, and polarization of electromagnetic waves simultaneously. The multi‐layer stacking scheme enables the mitigation of issues such as insufficient beam manipulation, image quality degradation, and undesirable diffraction orders, by spatially multiplexing resonators on the same metasurface.…”

Section: Introductionmentioning

confidence: 99%

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

Zhou

Lee

Park

et al. 2020

Advanced Optical Materials

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Multifunctional metasurfaces, which are planar devices featuring diverse functionalities, have attracted tremendous attention as they enable highly dense integration and miniaturization of photonic devices. Previous approaches based on spatial/spectral multiplexing of meta‐atoms on single metasurfaces are supposed to be inevitably limited in their functional diversity. An additional degree of freedom for design, achieved by cascading multiple metasurfaces into a single metasystem, promotes new combinations of functions that cannot be achieved with single‐layered metasurfaces. In this study, an all‐dielectric metasurface doublet (MD) is developed and implemented by vertically concatenating two arrays of rectangular nanoresonators on either side of a quartz substrate, in which distinct phase profiles are encoded for transverse magnetic and transverse electric polarized light. Multifunctional beam manipulation with concurrent increased beam deflection, beam reduction, and polarizing beam splitting is achieved at telecommunication wavelengths near 1550 nm. The MD is accurately created via lithographical nanofabrication, thus eliminating the extremely demanding post‐fabrication alignment. The proposed multifunctional metasurface is highly anticipated to expedite the development of advanced technologies for large‐scale photonic integration, optical metrology, light detection and ranging, spectroscopy, and optical processing.

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Section: Introductionmentioning

confidence: 99%

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

Zhou

Lee

Park

et al. 2020

Advanced Optical Materials

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“…To design meta-devices with target transmission profiles, it is needed to perform a large number of simulations in most meta-heuristic approaches. To resolve this issue, a machine-learning-based design approach [47] is considered in this article. Recently, machine learning (ML) has become well-known as a powerful computational tool that can be applied to many areas of science and engineering.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, we present an on-chip thermally controlled varifocal metalens based on silicon 1D metasurface doublets or triplets using an inverse design approach that is very similar to that of backpropagation [47], which is often used for training neural networks. Focus tunability is achieved by controlling the refractive index of silicon metalens through the thermo-optic effect.…”

Section: Introductionmentioning

confidence: 99%

Inverse Design of On-Chip Thermally Tunable Varifocal Metalens Based on Silicon Metalines

Zarei

Khavasi

2021

IEEE Access

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High-contrast transmitarray (HCTA) metasurfaces, named as metalines in this article, a category of lithographically defined on-chip diffractive elements with minimized scattering loss, enables parallel on-chip optical signal processing. While high-performance devices with different functionalities are reported, most of them are static, and their optical functions are fixed after fabrication. However, dynamically tunable metasurfaces are of essential need in many modern optical systems. Here, we employ an inverse design method, combining FDTD parameter sweep with Fourier-optics simulations, to design thermally-controlled varifocal metalenses. Thermal tunability is accomplished through the thermo-optical effect of silicon. Maximum focal length tunability of 12% and 24% are demonstrated for 400µm and 200µm aperture varifocal metalens doublets at the wavelength of 1.55µm, respectively. The focusing efficiency is more than 74% for the whole temperature range. The 400µm and 200µm aperture metalenses are able to concentrate the input beam to spot sizes less than one wavelength and two wavelengths, respectively. This paves the way for dynamically controlled silicon photonics computational chips.

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“…Adding additional metasurfaces would allow more control over the optical field (e.g. multi-wavelength performance 6,22,26 , or diffractive neural networks 26,32,33 for multi-input multi-output applications), but only two metasurfaces are necessary for amplitude and phase control at a single wavelength. As a proof of concept, we report experimental demonstrations of meta-optics that combine beam-forming and splitting, and produce high-quality, threedimensional holograms.…”

Section: Introductionmentioning

confidence: 99%

All-Dielectric Meta-optics for High-Efficiency Independent Amplitude and Phase Manipulation

Raeker

Zheng

Zhou

et al. 2021

Preprint

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Metasurfaces, composed of subwavelength scattering elements, have demonstrated remarkable control over the transmitted amplitude, phase, and polarization of light. However, manipulating the amplitude upon transmission has required loss if a single metasurface is used. Here, we describe high-efficiency independent manipulation of the amplitude and phase of a beam using two lossless phase-only metasurfaces separated by a distance. With this configuration, we experimentally demonstrate optical components such as combined beam-forming and splitting devices, as well as those for forming complex-valued, three-dimensional holograms. The compound meta-optic platform provides a promising approach for achieving high performance optical holographic displays and compact optical components, while exhibiting a high overall efficiency.

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Computational inverse design for cascaded systems of metasurface optics

Cited by 80 publications

References 92 publications

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

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

Inverse Design of On-Chip Thermally Tunable Varifocal Metalens Based on Silicon Metalines

All-Dielectric Meta-optics for High-Efficiency Independent Amplitude and Phase Manipulation

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