Abstract
The conventional fiber communication band of 1.55 $μ$m is reaching its limit attributable to the escalation in bandwidth requirements for high-speed and bulk data transmission. Researchers are exploring a 2 $μ$m waveband for its higher capacity and low attenuation as a solution for the next generation communication technologies. Accordingly, here we report an optically engineered metasurface for this waveband for fiber coupling or lensing. The structure is polarization-insensitive and dynamically tunable between its reflective (OFF) and transmissive (ON) modes. For tunability, we incorporate a novel phase change material In3SbTe2 (IST) for its faster, non-volatile, and reversible metallic-to-insulator phase transition. The integration of indium tin oxide (ITO) as a micro-heater to electrically modulate the light by altering the phase of IST provides the device with additional functionality for point-of-care applications. Using the finite-difference-time-domain (FDTD) technique, we have achieved a modulation depth of 90%. The focusing efficiency is as high as 76% and the ON-OFF switching ratio of the optimized lens is 26 dB. The multilayer insertion of thin IST ensures uniform phase transition with switching energy as low as 232.98 nJ/$μ$m^2. Thus, with remarkable performance at 2 $μ$m and dynamic multifunctionality, our proposed device will revolutionize the upcoming telecommunication technologies and beyond.
Citation
[J022]
(2024).
Polarization insensitive electrically reconfigurable meta-lens for the 2 $μ$m wavelength.
Opt. Mater. Express.
BibTeX
@article{J022,
abstract = {The conventional fiber communication band of 1.55 $μ$m is reaching its limit attributable to the escalation in bandwidth requirements for high-speed and bulk data transmission. Researchers are exploring a 2 $μ$m waveband for its higher capacity and low attenuation as a solution for the next generation communication technologies. Accordingly, here we report an optically engineered metasurface for this waveband for fiber coupling or lensing. The structure is polarization-insensitive and dynamically tunable between its reflective (OFF) and transmissive (ON) modes. For tunability, we incorporate a novel phase change material In3SbTe2 (IST) for its faster, non-volatile, and reversible metallic-to-insulator phase transition. The integration of indium tin oxide (ITO) as a micro-heater to electrically modulate the light by altering the phase of IST provides the device with additional functionality for point-of-care applications. Using the finite-difference-time-domain (FDTD) technique, we have achieved a modulation depth of 90%. The focusing efficiency is as high as 76% and the ON-OFF switching ratio of the optimized lens is 26 dB. The multilayer insertion of thin IST ensures uniform phase transition with switching energy as low as 232.98 nJ/$μ$m^2. Thus, with remarkable performance at 2 $μ$m and dynamic multifunctionality, our proposed device will revolutionize the upcoming telecommunication technologies and beyond.},
author = {Md. Asif Hossain Bhuiyan and Purbayan Das and me},
citationnos = {0},
citesurl = {https://scholar.google.com/citations?view_op=view_citation&hl=en&user=Fu8Hkb4AAAAJ&citation_for_view=Fu8Hkb4AAAAJ:NhqRSupF_l8C},
doi = {10.1364/OME.540435},
jif = {2.8},
journal = {Opt. Mater. Express},
keywords = {photonics},
month = {12},
number = {12},
pages = {2830--2843},
publisher = {Optica Publishing Group},
sjr = {Q2},
title = {Polarization insensitive electrically reconfigurable meta-lens for the 2 $μ$m wavelength},
volume = {14},
year = {2024}
}