Direct detection of photoinduced magnetic force at the nanoscale reveals magnetic nearfield of structured light

Zeng, Jinwei; Albooyeh, Mohammad; Rajaei, Mohsen; Sifat, Abid Anjum; Potma, Eric O.; Wickramasinghe, H. K.; Capolino, Filippo

doi:10.1126/sciadv.add0233

Cited by 14 publications

(6 citation statements)

References 47 publications

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“…We envision that the family of multipolar BSM forces here demonstrated, which comprises information about high-order derivatives of the local BSM, would also be exploited for developing advanced photon-induced microscopy for field measurements and topographic reconstruction. [8,52,53]…”

Section: Discussionmentioning

confidence: 99%

Optical Forces on Multipoles Induced by the Belinfante Spin Momentum

Zhou

Zhang

et al. 2023

Laser & Photonics Reviews

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The Belinfante spin momentum (BSM) is a fundamental yet enigmatic quantity of electromagnetic fields. It vanishes from the global momentum of the field, but can be detected locally, manifesting itself as an optical force on small particles. Hitherto, however, the BSM force is a concept well established only within the dipole approximation, and there is no explicit experimental evidence for its action on multipoles. Here, a theoretical model for multipolar BSM forces, exerted on generic Mie particles supporting multipoles of arbitrary order, is developed. This multipolar mechanical action is observed experimentally from a structured light field, which suppresses the effect of spin–orbit coupling. It can also selectively enhance the multipolar BSM forces, while restraining the dipolar component on a probe particle (Au sphere). These results constitute a distinct chapter in the physics of high‐order interactions in light–matter systems and can facilitate additional progress in optomechanics, optical manipulation, and Mie‐tronics.

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Section: Discussionmentioning

confidence: 99%

Optical Forces on Multipoles Induced by the Belinfante Spin Momentum

Zhou

Zhang

et al. 2023

Laser & Photonics Reviews

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“…the dipole force, on the tip [ 22 ]. Additionally, by incorporating a resonant nanostructure and employing structured light illumination, the tip can also be polarized as an exclusive magnetic dipole, enabling the direct detection of the magnetic dipole force [ 23 ]. Therefore, the PiDF is expected to show significantly localized multidimensional electromagnetic responses compared to those of the PiTF, so that imaging with PiDF could yield information far beyond the scope of PiTF, such as sample-tip distance, localized refractive index differences, and various types of subtle electric and magnetic near-field properties.…”

Section: Introductionmentioning

confidence: 99%

Surface-phonon-polariton-enhanced photoinduced dipole force for nanoscale infrared imaging

Li,

Jahng,

et al. 2024

National Science Review

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The photoinduced dipole force (PiDF) is an attractive force arising from the Coulombic interaction between the light-induced dipoles on the illuminated tip and the sample. It shows extreme sample-tip distance and refractive index dependence, which is promsing for nanoscale infrared (IR) imaging of ultrathin samples. However, the existence of PiDF in the mid-IR region has not been experimentally demonstrated due to the coexistence of photoinduced thermal force (PiTF), typically one to two orders of magnitude higher than PiDF. In this study, we demonstrate that, with the assistance of surface phonon polaritons, the PiDF of c-quartz can be enhanced to surpass its PiTF, enabling a clear observation of PiDF spectra reflecting the properties of the real part of permittivity. Leveraging the detection of PiDF of phonon polaritonic substrate, we propose a strategy to enhance the sensitivity and contrast of photoinduced force responses in transmission images, facilitating the precise differentiation of the heterogeneous distribution of ultrathin samples.

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“…As a nanoscopic chiro-optical measurement method, utilization of optical force is promising [4][5][6]. For the optical force measurements based on a scanning probe, photoinduced force microscopy (PiFM), has been developed and extensively investigated recently [7][8][9][10][11]. In PiFM, both the tip and the sample are irradiated by polarized light, and the nanoscopic optical responses of matters are observed via the motion of the tip induced by the incident light.…”

Section: Introductionmentioning

confidence: 99%

Nanoscopic visualization of chiro-optical field in photoinduced force microscopy

Yamanishi,

Ahn,

Okamoto

2023

Optical Manipulation and Structured Materials Conference

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Nanoscopic observation of chiro-optical phenomena is an intriguing scientific topic but have large difficulties in the measurements, and hence the physics is still largely unexplored. So far, the chiro-optical physics have not been well unveiled; conventionally, those phenomena have been investigated only through indirect information from the macroscopic far-field optical measurements and/or predictions by theoretical simulations. To fully understand and to utilize the full potential of chiro-optical systems, the local in-situ observation of the effects from individual components is essential, as the macroscopic chiro-optical effect is not straightforward for the analysis of the microscopic phenomena.In the present study, we attempted the imaging of the chiro-optical forces confined in the nanospaces based on a photoinduced force microscopy. On the right-handed gammadion structure, the strong optical gradient force appeared at the edges of the structure under illumination of LCP light at 785 nm. The left-handed gammadion gave the similar result under RCP illumination. This research paves the way for clarifying the physics of nanoscale chiro-optics and application of that.

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Direct detection of photoinduced magnetic force at the nanoscale reveals magnetic nearfield of structured light

Cited by 14 publications

References 47 publications

Optical Forces on Multipoles Induced by the Belinfante Spin Momentum

Optical Forces on Multipoles Induced by the Belinfante Spin Momentum

Surface-phonon-polariton-enhanced photoinduced dipole force for nanoscale infrared imaging

Nanoscopic visualization of chiro-optical field in photoinduced force microscopy

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