Presentation Information
[16p-B4-10]Tunable abrupt autofocusing meta-devices
〇(DC)Rong Lin1, Mu Ku Chen1, Din Ping Tsai1 (1.CityU)
Keywords:
metasurfaces,imaging
Abrupt autofocusing (AAF) beams, integrating features of circular Airy and Bessel beams, offer extended focal depths, self-healing properties, high precision, and minimal energy loss. These qualities make them ideal for advanced optical imaging, particle trapping, and laser surgery. Traditionally, spatial light modulators (SLMs) have been used to generate AAF beams by encoding their Fourier transform. However, SLMs suffer from low resolution, energy inefficiency, and a limited operational wavelength range, which hinder precise nanoscale operations. Additionally, their bulky size is at odds with the trend towards device miniaturization and integration. Metasurfaces, capable of manipulating wavefronts at subwavelength scales, present a superior alternative to traditional optical devices by offering reduced weight, increased efficiency, smaller size, and lower energy consumption. Metasurfaces have found applications in beam shaping, achromatic imaging, light-field sensing, holography, optical computing, quantum technologies, and biological imaging. Yet, challenges remain in biomedical applications, particularly in creating dynamic beams essential for improving image contrast, optical tweezing, and optimizing photodynamic therapy.
In this research, we introduce two types of tunable abrupt autofocusing meta-devices composed of dual metasurfaces. By adjusting the relative rotation between these metasurfaces, one device can dynamically steer the AAF beam, while the other adjusts its focal length. Importantly, these tuning methods are wavelength-independent and scalable. We anticipate that these tunable meta-devices will significantly advance the use of AAF beams in precise biomedical applications such as laser therapy, particle manipulation, and biological imaging.
In this research, we introduce two types of tunable abrupt autofocusing meta-devices composed of dual metasurfaces. By adjusting the relative rotation between these metasurfaces, one device can dynamically steer the AAF beam, while the other adjusts its focal length. Importantly, these tuning methods are wavelength-independent and scalable. We anticipate that these tunable meta-devices will significantly advance the use of AAF beams in precise biomedical applications such as laser therapy, particle manipulation, and biological imaging.
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