High efficiency laser photothermal excitation of microcantilever vibrations in air and liquids

Kiracofe, Daniel; Kobayashi, Kei; Labuda, Aleksander; Raman, Arvind; Yamada, Hirofumi

doi:10.1063/1.3518965

Cited by 69 publications

(44 citation statements)

References 21 publications

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“…Notably, the excitation of a microcantilever covered with Au NPs should contain both the thermal gradient effect for the area without Au NPs and the bi-material effect for the area covered with Au NPs (Figure 2b). In our case, our calculation indicates that the bi-material effect is in phase ( α Au = 14.2 µm·m −1 ·K −1 , α Si = 2.6 µm·m −1 ·K −1 ), but greater than the thermal gradient effect 10, 30 .…”

Section: Resultsmentioning

confidence: 43%

Plasmonic Microcantilever with Remarkably Enhanced Photothermal Responses

Gao

Zhao

Jia

et al. 2017

Sci Rep

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Plasmonic nanostructures exhibit abundant optoelectronic properties. We explore here the technological potentials of plasmonic nanostructures as active component to actuate microcantilever sensors. We find that the photothermal excitation of microcantilevers can be greatly enhanced by Au nanoparticle (NPs). A detailed investigation reveals that the enhancement is wavelength dependent and can be attributed to selective excitation of localized surface plasmon resonance (LSPR). The associated effects are discussed based on a thorough examination of the geometric aspects of Au NPs, microcantilever lengths, and incident optical power. Some technological advantages offered by this method are also discussed.

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Section: Resultsmentioning

confidence: 43%

Plasmonic Microcantilever with Remarkably Enhanced Photothermal Responses

Gao

Zhao

Jia

et al. 2017

Sci Rep

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“…The latter can, for example, improve the time response without sacrificing the force sensitivity [48] or even to increase the force sensitivity [49]. Furthermore photothermal cantilever actuation may be used to realize fast scanning rates or low noise scanning in low Q environments such as scanning in liquids [50][51][52][53][54][55].…”

Section: Indirect Effects Of Optical Fieldsmentioning

confidence: 99%

Optically induced forces in scanning probe microscopy

et al. 2014

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Typical measurements of light in the near-field utilize a photodetector such as a photomultiplier tube or a photodiode, which is placed remotely from the region under test. This kind of detection has many draw-backs including the necessity to detect light in the far-field, the influence of background propagating radiation, the relatively narrowband operation of photodetectors which complicates the operation over a wide wavelength range, and the difficulty in detecting radiation in the far-IR and THz. Here we review an alternative near-field light measurement technique based on the detection of optically induced forces acting on the scanning probe. This type of detection overcomes some of the above limitations, permitting true broad-band detection of light directly in the near-field with a single detector. The physical origins and the main characteristics of optical force detection are reviewed. In addition, intrinsic effects of the inherent optical forces for certain operation modalities of scanning probe microscopy are discussed. Finally, we review practical applications of optical force detection of interest for the broader field of the scanning probe microscopy.

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“…Oscillating the power of the PTE drive laser results in cantilever motion via a combination of local thermal gradients and bimorph bending. 13 For PTE, the maximum sub-resonance A will occur when the cantilever is freely vibrating far from the sample. For acoustic excitation with a piezoelectric actuator at the cantilever base, there is near zero sub-resonance response in free vibration and maximum response when in contact with a stiff surface.…”

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confidence: 99%

Photothermally excited force modulation microscopy for broadband nanomechanical property measurements

Wagner

Killgore

2015

Applied Physics Letters

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We demonstrate photothermally excited force modulation microscopy (PTE FMM) for mechanical property characterization across a broad frequency range with an atomic force microscope (AFM). Photothermal excitation allows for an AFM cantilever driving force that varies smoothly as a function of drive frequency, thus avoiding the problem of spurious resonant vibrations that hinder piezoelectric excitation schemes. A complication of PTE FMM is that the sub-resonance cantilever vibration shape is fundamentally different compared to piezoelectric excitation. By directly measuring the vibrational shape of the cantilever, we show that PTE FMM is an accurate nanomechanical characterization method. PTE FMM is a pathway towards the characterization of frequency sensitive specimens such as polymers and biomaterials with frequency range limited only by the resonance frequency of the cantilever and the low frequency limit of the AFM.

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High efficiency laser photothermal excitation of microcantilever vibrations in air and liquids

Cited by 69 publications

References 21 publications

Plasmonic Microcantilever with Remarkably Enhanced Photothermal Responses

Plasmonic Microcantilever with Remarkably Enhanced Photothermal Responses

Optically induced forces in scanning probe microscopy

Photothermally excited force modulation microscopy for broadband nanomechanical property measurements

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