Nanomechanical photothermal sensing has significantly advanced single-molecule/particle microscopy and spectroscopy,and infrared detection.In this approach,the nanomechanical resonator detects shifts in resonant frequ...Nanomechanical photothermal sensing has significantly advanced single-molecule/particle microscopy and spectroscopy,and infrared detection.In this approach,the nanomechanical resonator detects shifts in resonant frequency due to photothermal heating.However,the relationship between photothermal sensitivity,response time,and resonator design has not been fully explored.This paper compares three resonator types-strings,drumheads,and trampolines-to explore this relationship.Through theoretical modeling,experimental validation,and finite element method simulations,we find that strings offer the highest sensitivity(with a noise equivalent power of 280 fW/Hz^(1/2)for strings made of silicon nitride),while drumheads exhibit the fastest thermal response.The study reveals that photothermal sensitivity correlates with the average temperature rise and not the peak temperature.Finally,the impact of photothermal back-action is discussed,which can be a major source of frequency instability.This work clarifies the performance differences and limits among resonator designs and guides the development of advanced nanomechanical photothermal sensors,benefiting a wide range of applications.展开更多
Remote passive drone detection in the presence of strong background noise is challenging,since they are point objects and cannot be recognized by their contour detection.In this study,we introduce a new passive single...Remote passive drone detection in the presence of strong background noise is challenging,since they are point objects and cannot be recognized by their contour detection.In this study,we introduce a new passive single-photon dynamic imaging method using quantum compressed sensing.This method utilizes the inherent randomness of photon radiation and detection to construct a compressive imaging system.It captures the broadband dynamic features of the point object through sparse photon detection,achieving a detectable bandwidth up to 2.05 GHz,which is significantly higher than current photon-counting imaging techniques.The method also shows excellent noise resistance,achieving high-quality imaging with a signal-to-background ratio of 1/332.This technique significantly enhances the use of single-photon imaging in real-world applications.展开更多
基金funding from the Novo Nordisk Foundation under project MASMONADE with project number NNF22OC0077964,and from the European Innovation Council under the European Union’s Horizon Europe Transition Open program(Grant agreement:101058711-NEMILIES).
文摘Nanomechanical photothermal sensing has significantly advanced single-molecule/particle microscopy and spectroscopy,and infrared detection.In this approach,the nanomechanical resonator detects shifts in resonant frequency due to photothermal heating.However,the relationship between photothermal sensitivity,response time,and resonator design has not been fully explored.This paper compares three resonator types-strings,drumheads,and trampolines-to explore this relationship.Through theoretical modeling,experimental validation,and finite element method simulations,we find that strings offer the highest sensitivity(with a noise equivalent power of 280 fW/Hz^(1/2)for strings made of silicon nitride),while drumheads exhibit the fastest thermal response.The study reveals that photothermal sensitivity correlates with the average temperature rise and not the peak temperature.Finally,the impact of photothermal back-action is discussed,which can be a major source of frequency instability.This work clarifies the performance differences and limits among resonator designs and guides the development of advanced nanomechanical photothermal sensors,benefiting a wide range of applications.
基金supported by Shanxi Province Science and Technology Major Special Project(202201010101005)the Natural Science Foundation of China(U22A2091,62105193,62127817,62075120,62075122,62222509,62205187,6191101445 and 62305200)+4 种基金China Postdoctoral Science Foundation(2022M722006)National Key Research and Development Program of China(2022YFA1404201)Shanxi Province Science and Technology Innovation Talent Team(No.202204051001014)Science and Technology Cooperation Project of Shanxi Province(202104041101021)Shanxi“1331 Project”,111 projects(D18001).
文摘Remote passive drone detection in the presence of strong background noise is challenging,since they are point objects and cannot be recognized by their contour detection.In this study,we introduce a new passive single-photon dynamic imaging method using quantum compressed sensing.This method utilizes the inherent randomness of photon radiation and detection to construct a compressive imaging system.It captures the broadband dynamic features of the point object through sparse photon detection,achieving a detectable bandwidth up to 2.05 GHz,which is significantly higher than current photon-counting imaging techniques.The method also shows excellent noise resistance,achieving high-quality imaging with a signal-to-background ratio of 1/332.This technique significantly enhances the use of single-photon imaging in real-world applications.
