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Revealing invisible scattering poles with complex-frequency signals.

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Bibliographic Details
Title: Revealing invisible scattering poles with complex-frequency signals.
Authors: Trivedi, Deepanshu1 (AUTHOR), Madanayake, Arjuna1 (AUTHOR), Krasnok, Alex1,2 (AUTHOR) akrasnok@fiu.edu
Source: Journal of Applied Physics. 6/28/2025, Vol. 137 Issue 24, p1-8. 8p.
Subject Terms: *HIGH resolution imaging, *RADIO frequency, *TELECOMMUNICATION, *COMMUNICATION of technical information, *SIGNALS & signaling
Abstract: Complex-frequency signals have been employed to increase light capture, improve the sensitivity of optical detection systems, and reduce losses in superresolution imaging setups. In this work, we present an approach that uses complex-frequency excitations to expose previously undetectable hidden or invisible poles, which feature predominantly imaginary components. By tailoring poles and zeros in the complex-frequency plane, it is shown that these otherwise invisible poles can strongly influence the scattering effects when they couple to visible poles. The efficient transformation of non-oscillating fields into oscillating ones is demonstrated. This phenomenon is confirmed in both radio frequency and optical domains, specifically within the C-band infrared range crucial for communication technologies. The findings deepen the theoretical understanding of wave interactions in photonic platforms and offer promising directions for designing advanced photonic devices. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
Description
Abstract:Complex-frequency signals have been employed to increase light capture, improve the sensitivity of optical detection systems, and reduce losses in superresolution imaging setups. In this work, we present an approach that uses complex-frequency excitations to expose previously undetectable hidden or invisible poles, which feature predominantly imaginary components. By tailoring poles and zeros in the complex-frequency plane, it is shown that these otherwise invisible poles can strongly influence the scattering effects when they couple to visible poles. The efficient transformation of non-oscillating fields into oscillating ones is demonstrated. This phenomenon is confirmed in both radio frequency and optical domains, specifically within the C-band infrared range crucial for communication technologies. The findings deepen the theoretical understanding of wave interactions in photonic platforms and offer promising directions for designing advanced photonic devices. [ABSTRACT FROM AUTHOR]
ISSN:00218979
DOI:10.1063/5.0262971