Novel dynamics of optical manipulation of objects with sub-wavelength structure

AbstractWe demonstrate experimentally that Tamm plasmons in the near infrared can be supported by a dielectric mirror interfaced with a metasurface, a discontinuous thin metal film periodically patterned on the sub-wavelength scale. More crucially, not only do Tamm plasmons survive the nanopatterning of the metal film but they also become sensitive to external perturbations as a result. In particular, by depositing a nematic liquid crystal on the outer side of the metasurface, we were able to red shift the spectral position of Tamm plasmon by 35 nm, while electrical switching of the liquid crystal enabled us to tune the wavelength of this notoriously inert excitation within a 10-nm range.

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Topological interface states in translational metamaterials for sub-wavelength in-plane waves

International Journal of Mechanical Sciences ◽

10.1016/j.ijmecsci.2021.106308 ◽

2021 ◽

Vol 197 ◽

pp. 106308

Author(s):

Yijie Liu ◽

Liang Jin ◽

Hongfa Wang ◽

Dongying Liu ◽

Yingjing Liang

Keyword(s):

Plane Waves ◽

Interface States ◽

Sub Wavelength

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3D printed microfluidic lab-on-a-chip device for fiber-based dual beam optical manipulation

Scientific Reports ◽

10.1038/s41598-021-93205-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Haoran Wang ◽

Anton Enders ◽

John-Alexander Preuss ◽

Janina Bahnemann ◽

Alexander Heisterkamp ◽

...

Keyword(s):

Optical Fibers ◽

Single Cells ◽

Lab On A Chip ◽

Cost Effective ◽

Optical Manipulation ◽

Hydrodynamic Focusing ◽

Trapping Region ◽

Dual Beam ◽

3D Printed ◽

On Chip

Abstract3D printing of microfluidic lab-on-a-chip devices enables rapid prototyping of robust and complex structures. In this work, we designed and fabricated a 3D printed lab-on-a-chip device for fiber-based dual beam optical manipulation. The final 3D printed chip offers three key features, such as (1) an optimized fiber channel design for precise alignment of optical fibers, (2) an optically clear window to visualize the trapping region, and (3) a sample channel which facilitates hydrodynamic focusing of samples. A square zig–zag structure incorporated in the sample channel increases the number of particles at the trapping site and focuses the cells and particles during experiments when operating the chip at low Reynolds number. To evaluate the performance of the device for optical manipulation, we implemented on-chip, fiber-based optical trapping of different-sized microscopic particles and performed trap stiffness measurements. In addition, optical stretching of MCF-7 cells was successfully accomplished for the purpose of studying the effects of a cytochalasin metabolite, pyrichalasin H, on cell elasticity. We observed distinct changes in the deformability of single cells treated with pyrichalasin H compared to untreated cells. These results demonstrate that 3D printed microfluidic lab-on-a-chip devices offer a cost-effective and customizable platform for applications in optical manipulation.

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Generation of microstructures and extreme sub-wavelength laser-induced periodic structures on the Si surface using $$\hbox {N}_{2}$$ nanosecond pulsed laser for the reduction of reflectance

Pramana ◽

10.1007/s12043-020-02051-3 ◽

2021 ◽

Vol 95 (1) ◽

Author(s):

P Chandrakanta Singh ◽

Susanta Kumar Das

Keyword(s):

Periodic Structures ◽

Pulsed Laser ◽

Nanosecond Pulsed Laser ◽

Sub Wavelength

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Ultra-high-Q resonances in plasmonic metasurfaces

Nature Communications ◽

10.1038/s41467-021-21196-2 ◽

2021 ◽

Vol 12 (1) ◽

Cited By ~ 2

Author(s):

M. Saad Bin-Alam ◽

Orad Reshef ◽

Yaryna Mamchur ◽

M. Zahirul Alam ◽

Graham Carlow ◽

...

Keyword(s):

Incident Light ◽

Reducing Power ◽

Field Enhancement ◽

Plasmonic Nanostructures ◽

High Q ◽

Alternative Material ◽

Order Of Magnitude ◽

Wavelength Scale ◽

Strong Confinement ◽

Sub Wavelength

AbstractPlasmonic nanostructures hold promise for the realization of ultra-thin sub-wavelength devices, reducing power operating thresholds and enabling nonlinear optical functionality in metasurfaces. However, this promise is substantially undercut by absorption introduced by resistive losses, causing the metasurface community to turn away from plasmonics in favour of alternative material platforms (e.g., dielectrics) that provide weaker field enhancement, but more tolerable losses. Here, we report a plasmonic metasurface with a quality-factor (Q-factor) of 2340 in the telecommunication C band by exploiting surface lattice resonances (SLRs), exceeding the record by an order of magnitude. Additionally, we show that SLRs retain many of the same benefits as localized plasmonic resonances, such as field enhancement and strong confinement of light along the metal surface. Our results demonstrate that SLRs provide an exciting and unexplored method to tailor incident light fields, and could pave the way to flexible wavelength-scale devices for any optical resonating application.

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