Breaking the diffraction limit in absorption spectroscopy using upconverting nanoparticles

Kumar, S. Sunil; Gunaseelan, M.; Vaippully, Rahul; Banerjee, Ayan; Roy, Basudev

doi:10.1039/d1nr02103f

Cited by 13 publications

(8 citation statements)

References 42 publications

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“…We show that Fe-doped upconversion NaYF 4 :Yb,Er particles (Fe-NYF) have ferromagnetic features, yet the refractive index is quite conducive to optical tweezers measurements (the lattice NaYF 4 has a refractive index of 1.47), even for particles as large as 5 μm, with a large saturation magnetization of 1 A m 2 kg –1 . The upconversion NaYF 4 :Yb,Er (NYF) nonmagnetic particles have been routinely used with optical tweezers. − Also, the emission properties of these particles at different wavelengths can be enhanced through Fe doping, , and external magnetic fields are employed to modulate the spectral lines of such a particle through Zeeman splitting and shifting . However, for the first time, the magnetic properties of these NYFs through co-doping with Fe are being explored.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Optical Trapping and Electromagnetic Micromanipulation of Ferromagnetically Doped NaYF₄ Microparticles

Nalupurackal

Murugan

Lokesh

et al. 2023

ACS Appl. Opt. Mater.

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Optical trapping allows the trapping and manipulation of dielectric microparticles. However, full control over all six degrees of freedom of the trapped object is challenging. Here, we use ferromagnetic iron-doped upconversion microparticles for simultaneous optical trapping and magnetic micromanipulation that allows full control over all translational and rotational degrees of freedom. These microparticles have a low absorption that allows optical trapping and a high coercivity and saturation magnetization that allow magnetic manipulation. The particles will enable micromanipulation experiments, for example, in single-molecule biophysics.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Optical Trapping and Electromagnetic Micromanipulation of Ferromagnetically Doped NaYF₄ Microparticles

Nalupurackal

Murugan

Lokesh

et al. 2023

ACS Appl. Opt. Mater.

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“…Thus, the particle is indeed responsible for absorption and subsequent heating. It may be noted here that water itself is about 3 times more absorptive at 975 nm than 1064 nm [43], which might partially account for an increase in heating efficiency. It may also be noted here that the figure 4(b) shows a white patch which is the visible emission from the particle upon being illuminated by the 975nm light with a spectrum shown in figure 1.…”

Section: Heat Generation With Single Fe-nyf Particlementioning

confidence: 73%

Facets of optically and magnetically induced heating in ferromagnetically doped-NaYF₄ particles

et al. 2023

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Upconverting particles like Yb and Er-doped NaYF$_4$ are known to heat up after illumination with light at pump wavelength due to inefficient upconversion processes. Here we show that NaYF$_4$ particles which have been co-doped not only with Yb and Er but also Fe improves the photothermal conversion efficiency. In addition, we show for the first time that alternating magnetic fields also heat up the ferromagnetic particles. Thereafter we show that a combination of optical and magnetic stimuli significantly increases the heat generated by the particles.

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“…In this manuscript, we use a similar set-up to engineer a Stirling engine, however, with the utilization of upconverting particles (UCPs) as working substances instead of colloids. Optical trapping of UCPs [22][23][24] has gained recent interest as their potential varies from imaging to therapy [25][26][27][28]. Generation, control and detection of out-of-plane rotational motions [29][30][31][32] of single UCP along with the translations in optical tweezers [33,34] to explore their micro-rheological and mechanical potentials have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Towards Stirling engine using an optically confined particle subjected to asymmetric temperature profile

et al. 2023

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The realization of microscopic heat engines has gained a surge of research interest in statistical physics, soft matter, and biological physics. A typical microscopic heat engine employs a colloidal particle trapped in a confining potential, which is modulated in time to mimic the cycle operations. Here, we use a lanthanide-doped upconverting particle (UCP) suspended in a passive aqueous bath, which is highly absorptive at 975 nm and converts NIR photons to visible, as the working substance of the engine. When a single UCP is optically trapped with a 975 nm laser, it behaves like an active particle by executing motion subjected to an asymmetric temperature profile along the direction of propagation of the laser. The strong absorption of 975 nm light by the particle introduces a temperature gradient and results in significant thermophoretic diffusion along the temperature gradient. However, the activity of the particle vanishes when the trapping wavelength is switched to 1064 nm. We carefully regulate the wavelength-dependent activity of the particle to engineer all four cycles of a Stirling engine by using a combination of 1064 nm and 975 nm wavelengths. Since the motion of the particle is stochastic, the work done on the particle due to the stiffness modulation per cycle is random. We provide statistical estimation for this work averaged over 5 cycles which can be extended towards several cycles to make a Stirling engine. Our experiment proposes a robust set-up to systematically harness temperature which is a crucial factor behind building microscopic engines.

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Breaking the diffraction limit in absorption spectroscopy using upconverting nanoparticles

Abstract: We employ a single optically trapped upconverting nanoparticle (UCNP) of NaYF$_4$:Yb,Er of diameter about 100 nm as a subdiffractive source to perform absorption spectroscopy. The experimentally expected mode volume of...

Cited by 13 publications

References 42 publications

Simultaneous Optical Trapping and Electromagnetic Micromanipulation of Ferromagnetically Doped NaYF₄ Microparticles

Simultaneous Optical Trapping and Electromagnetic Micromanipulation of Ferromagnetically Doped NaYF₄ Microparticles

Facets of optically and magnetically induced heating in ferromagnetically doped-NaYF₄ particles

Towards Stirling engine using an optically confined particle subjected to asymmetric temperature profile

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Breaking the diffraction limit in absorption spectroscopy using upconverting nanoparticles

Abstract: We employ a single optically trapped upconverting nanoparticle (UCNP) of NaYF$_4$:Yb,Er of diameter about 100 nm as a subdiffractive source to perform absorption spectroscopy. The experimentally expected mode volume of...

Cited by 13 publications

References 42 publications

Simultaneous Optical Trapping and Electromagnetic Micromanipulation of Ferromagnetically Doped NaYF4 Microparticles

Simultaneous Optical Trapping and Electromagnetic Micromanipulation of Ferromagnetically Doped NaYF4 Microparticles

Facets of optically and magnetically induced heating in ferromagnetically doped-NaYF4 particles

Towards Stirling engine using an optically confined particle subjected to asymmetric temperature profile

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Resources

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Simultaneous Optical Trapping and Electromagnetic Micromanipulation of Ferromagnetically Doped NaYF₄ Microparticles

Simultaneous Optical Trapping and Electromagnetic Micromanipulation of Ferromagnetically Doped NaYF₄ Microparticles

Facets of optically and magnetically induced heating in ferromagnetically doped-NaYF₄ particles