Characterization of periodic plasmonic nanoring devices for nanomanipulation

Σεργίδης, Μάριος; Truong, Viet Giang; Prakash, Prabha; Schloss, James; Bhardwaj, Bishwajeet Singh; Chormaic, Síle Nic

doi:10.1117/12.2186700

Cited by 2 publications

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“…Using the standard optical tweezers technique, direct optical manipulation is restricted to moderately larger systems such as cells [4], bacteria [5] and DNA strains [6]. In recent years, different approaches have been studied to overcome this size limitation, such as slotted waveguides [7], plasmonic structures [8,9] and photonic crystal cavities [10]. Plasmonic devices have received special attention due to their ability to confine nanoparticles [11][12][13], and their potential applications in the field of surfaceenhanced spectroscopy [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Highly tunable plasmonic nanoring arrays for nanoparticle manipulation and detection

2016

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The advancement of trapping and detection of nano-objects at very low laser powers in the near-infra-red region (NIR) is crucial for many applications. Singular visible-light nano-optics based on abrupt phase changes have recently demonstrated a significant improvement in molecule detection. Here, we propose and demonstrate tunable plasmonic nanodevices, which can improve both the trapping field enhancement and detection of nano-objects using singular phase drops in the NIR range. The plasmonic nanostructures, which consist of gaps with dimensions 50 nm × 50 nm connecting nanorings in arrays is discussed. These gaps act as individual detection and trapping sites. The tunability of the system is evident from extinction and reflection spectra while increasing the aperture size in the arrays. Additionally, in the region where the plasmonic nano-array exhibits topologically-protected, near-zero reflection behaviour, the phase displays a rapid change. Our experimental data predict that, using this abrupt phase changes, one can improve the detection sensitivity by 10 times compared to the extinction spectra method. We finally report experimental evidence of 100 nm polystyrene beads trapping using low incident power on these devices. The overall design demonstrates strong capability as an optical, label-free, non-destructive tool for single molecule manipulation where low trapping intensity, minimal photo bleaching and high sensitivity is required.

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Section: Introductionmentioning

confidence: 99%

Highly tunable plasmonic nanoring arrays for nanoparticle manipulation and detection

2016

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“…More details of the fabrication process are described in our earlier work 9,10 . Scanning electron microscope (SEM) images of the nano-ring arrays with 147.2 ± 9.7 nm and 187.3 ± 1.9 nm inner disks are shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Nano-ring arrays for sub-micron particle trapping

2017

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Plasmonic optical tweezers based on nanostructures fabricated on thin metal films have been studied as an alternative system to conventional optical tweezers for nanoparticle trapping and manipulation 1-3 . The incident laser beam can be confined beyond the diffraction limit at the nano-apertures and the intensity of the local field is significantly enhanced because of the surface plasmon resonance (SPR) phenomenon. The plasmonic resonance frequency can be tuned by modifying the dimensions of the nano-structures and the period of the array. This feature is especially beneficial for trapping biological particles. To minimize photo damage to a trapped particle, the resonance frequency can be shifted into the near infrared region (NIR) 4， 5 . Besides the enhanced local field intensity, the self-induced back-action (SIBA) effect can be used to enhance the trap stiffness with a red-shifted incident frequency 6， 7 .In this work, we demonstrate a plasmonic tweezers based on an array of nano-rings connected by nano-size slits. For each nano-ring structure, a coaxial inner disk is fabricated inside a nano-hole. A cylindrical surface plasmonic (CSP) resonance is generated at the aperture of the nano-ring and a transmission peak is observed 8 . This peak becomes narrower with the presence of the nano-slit. When the size of the aperture is reduced, this peak is redshifted. The trap stiffness is compared between two nanoring arrays with different diameters of inner disks. *xue.han@oist.jp, https://groups.oist.jp/light The SIBA effect is observed for the nano-ring array under the red-shifted incident laser condition. Combined with other sensing technologies, plasmonic tweezers based on these nano-ring arrays have huge potential as components in a lab-on-a-chip system. II ExperimentThe array of nano-apertures is fabricated on a 50 nm gold thin film using a focused ion beam (FIB). More details of the fabrication process are described in our earlier work 9, 10 . Scanning electron microscope (SEM) images of the nano-ring arrays with 147.2 ± 9.7 nm and 187.3 ± 1.9 nm inner disks are shown in Fig. 1(a) and (b), respectively. The average diameter of the nano-hole is 293.3 ± 13.3 nm, the period is 361.2 ± 3.1 nm, and the width of the connecting slit is 39.6 ± 4.6 nm. The connecting slits are only fabricated along the vertical direction and horizontally polarized incident light is used for experiments.A finite-difference time-domain (FDTD) simulation is used to obtain the transmission spectra. Dimensions from SEM images are used for the simulation. As shown in Fig. 1(c), the CSP resonance peak is narrower for nano-ring arrays with 147.2 nm inner disks when connecting slits are present. With bigger inner disks, the CSP resonance peak is shifted towards the red. A Ti: Sapphire laser at 980 nm, which is red shifted for the nano-ring array with 147.2 nm inner disks and close to the resonance for the nano-ring array with 187.3 nm inner disks, is used for AbstractPlasmonic tweezers based on nano-ring arrays on gold thin film are demonstrate...

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Characterization of periodic plasmonic nanoring devices for nanomanipulation

Cited by 2 publications

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Highly tunable plasmonic nanoring arrays for nanoparticle manipulation and detection

Highly tunable plasmonic nanoring arrays for nanoparticle manipulation and detection

Nano-ring arrays for sub-micron particle trapping

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