Nanotechnology Now – Press Release: Researchers realize high-efficiency frequency conversion on integrated photonic chip

Residence > Press > Researchers understand high-efficiency frequency conversion on built-in photonic chip

Summary:
A workforce led by Prof. GUO Guangcan and Prof. ZOU Changling from the College of Science and Know-how of China of the Chinese language Academy of Sciences realized environment friendly frequency conversion in microresonators through a degenerate sum-frequency course of, and achieved cross-band frequency conversion and amplification of transformed sign by means of observing the cascaded nonlinear optical results contained in the microresonator. The examine was revealed in Physics Assessment Letters.

Researchers understand high-efficiency frequency conversion on built-in photonic chip


Hefei, China | Posted on April 23rd, 2021

Coherent frequency conversion course of has large utility in classical and quantum info fields comparable to communication, detection, sensing, and imaging. As a bridge connecting wavebands between fiber telecommunications and atomic transition, coherent frequency conversion is a crucial interface for distributed quantum computing and quantum networks.

Built-in nonlinear photonic chip stands out due to its important technological advances of enhancing nonlinear optical results by microresonator’s enhancing the light-matter interplay, together with different benefits like small measurement, nice scalability, and low power consumption. These make built-in nonlinear photonic chips an necessary platform to covert optical frequency effectively and understand different nonlinear optical results.

Nonetheless, the on-chip resonant-enhanced coherent frequency conversion requires a number of (three or extra) modes of part matching situation amongst distinct wavelengths, which imposes important challenges to the gadgets’ design, fabrication, and modulation. Particularly within the utility of atomic and molecular spectroscopy, the intrinsic error introduced by nanofabrication strategy of built-in nonlinear photonic chips makes the resonant frequency of microresonator laborious to match atomic transition frequency.

The researchers on this examine proposed a brand new scheme for high-efficiency coherent frequency conversion requiring solely the two-mode part matching situation through a degenerate sum-frequency course of. They achieved exact tuning of the frequency window (FW): coarse tuning by adjusting the gadget temperature with a tuning vary of 100 GHz; effective tuning with MHz degree primarily based on earlier work of all-optical thermal management in an built-in microcavity.

The outcomes confirmed that the most effective achieved effectivity was as much as 42% through the photon-number conversion from 1560-nm-wide to 780-nm-wide wavelength, indicating a frequency tuning bandwidth over 250GHz. This happy the interconnection of telecom photons and rubidium (Rb) atoms.

Moreover, the researchers experimentally verified cascaded χ(2) and Kerr nonlinear optical results inside a single microresonator to amplify the transformed sign, which was uncared for earlier than. Thus the best conversion effectivity was potential to realize over 100% by means of adjusting gadget fabrication parameters, fulfilling concurrently sign transformed and amplified.

This examine gives a novel approach for environment friendly on-chip frequency conversion, which is extraordinarily necessary for on-chip quantum info processing.

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For extra info, please click on right here

Contacts:
Jane FAN Qiong

86-551-636-07280

Copyright © College of Science and Know-how of China (USTC)

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