Combining meta-structures with various optical waveguides for integrated photonics and more
Composed of thoughtfully designed microscopic photonic structures with subwavelength characteristics, the concepts of metasurface and metamaterials have given fruitful results in the field of meta-optics. Previous research has mainly focused on the application of meta-structures to adapt light in free space and develop relevant devices and applications. However, recent research reveals the great potential to take advantage of meta-structured subwavelength waveguides to enable exotic waveguiding phenomena and to design new waveguide-based devices.
For example, photonic integrated circuits appear as a promising candidate to revolutionize conventional integrated electronic circuits for their exceptional advantages such as high bandwidth, high operating speed and low power consumption. Nonetheless, as the most fundamental building block of integrated photonics, conventional optical waveguides still face challenges in terms of size, compromised light-matter interaction efficiency, and limited available functionality. Fortunately, the concept of meta-waveguides can be adopted here to open a new path to powerful manipulation of guided light at a below-wavelength scale, infusing new degrees of freedom into guide landscapes. of waves to significantly improve the performance of the device and allow new features.
In a new article published in the journal de Light: science and applications, a team of scientists from China, the United States and Italy presented a comprehensive review article providing an overview of the optics of wave meta-guides. The latest advances in various subwavelength metastructured waveguides are systematically documented, encompassing a broad class of photonic devices and systems that combine metamaterials and metasurfaces with various optical waveguides (dielectric / plasmonic fibers). / optics). Brief fundamentals of physics with explicit design methods (including direct and reverse design tutorials) and representative applications for meta waveguides are comprehensively summarized. The authors highlight how the incorporation of meta-optics concepts with waveguide technologies can propel photonic integrated circuits to new heights, providing efficient and versatile coupling interfaces, new optical signal processing paradigms. on chip and various platforms for sensing, imaging and artificial intelligence.
The article presents the zoology of the family of meta-waveguides. A plethora of applications are prototyped on this flexible playing field, including, for example, metasurface pattern dielectric waveguides, forward-designed metamaterial waveguides, metasurface or metamaterial hybrid optical fibers, meta-structure assisted plasmon waveguides and inversely designed metamaterial waveguides, to name a few.
Research also illustrates that wave meta-guides can be categorized via design methods or underlying waveguide platforms.
“On the one hand, wave meta-guides can be designed by intuition-based physical approaches (i.e. prospective design now) by exploiting the toolbox of metasurfaces and metamaterials with guide optics of waves “, note the researchers.
âOn the other hand, we can also use the reverse design, which relies on IT optimizationsâ¦
Photonic structures with designed details at subwavelength are canonical to meta waveguides. Taking two-dimensional periodic silicon segments as an example, meta-waveguides must be modeled as an efficient design medium, which is different from the photonic band gap theory found in photonic crystals or from the theory of photonic crystals. scalar diffraction used in non-subwavelength gratings.
“Although the concept of wave meta-guides is still in its infancy, some exciting progress [is emerging] with bright perspectives and deep potential applications. As conceptually illustrated [â¦] The advancement of meta-waveguides may not only extend meta-optics to the field of guided electromagnetic waves and waveguide technology, but also promise to reshape the landscapes of photonic integrated circuits and massive emerging applications The scientists considered.
Meta-waveguides can further venture into photonic integrated circuits and many relevant applications for detection, imaging and biomedical sensing in new territories. Massive new functions of emerging devices are still waiting to be explored in this dynamic field.
Photonic waveguides eliminate “neighbor crosstalk”
Yuan Meng et al, Optical waveguides for integrated photonics and beyond, Light: science and applications (2021). DOI: 10.1038 / s41377-021-00655-x
Chinese Academy of Sciences
Combine meta-structures with various optical waveguides for integrated photonics and more (2021, December 27)
retrieved December 28, 2021
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