Investigating the use of a hybrid plasmonic–photonic nanoresonator for optical trapping using finite-difference time-domain method

Abstract

We investigate the use of a hybrid nanoresonator comprising a photonic crystal (PhC) cavity coupled to a plasmonic bowtie nanoantenna (BNA) for the optical trapping of nanoparticles in water. Using finite-difference time-domain simulations, we show that this structure can confine light to an extremely small volume of $ 30; 000 nm 3 ð $ 30 zl) in the BNA gap whilst maintaining a high quality factor (5400-7700). The optical intensity inside the BNA gap is enhanced by a factor larger than 40 compared to when the BNA is not present above the PhC cavity. Such a device has potential applications in optical manipulation, creating high precision optical traps with an intensity gradient over a distance much smaller than the diffraction limit, potentially allowing objects to be confined to much smaller volumes and making it ideal for optical trapping of Rayleigh particles (particles much smaller than the wavelength of light).

Applications of Hybrid Metal‐Dielectric Nanostructures: State of the Art

“…The possibility of using hybrid nanoresonators for the optical trapping of NPs was proposed in ref. [288]. The structure consisted of a photonic crystal cavity coupled to a plasmonic bow‐tie nanoantenna.…”

New structure for an all-optical logic gate based on hybrid plasmonic square-shaped nanoring resonators and strips

“…The fourth criteria are insertion loss (IL) in dB which is de ned as the loss in signal power from the input port to the minimum transmission of the output port in the case of ON state and is illustrated by 40 : The optical power ratio at the output (Transmission) can be reduced or raised depending on two important factors 43,44 , one of them is the port position the other is the polarization of the incoming eld and its phase, on the other hand, the logic gates performance is calculated based on the fundamental of enhancement and destroying interferences between the input light signal(s) and control light signal(s) according to 17,21 , it is depending strongly as we mentioned on the port position and the phase of the incident eld when the other parameters (size, shape, material, and dimensions of the con guration remain unchanged).…”

Long-distance heat transfer between molecular systems through a hybrid plasmonic-photonic nanoresonator

“…Hybrid plasmonic-photonic (i.e., metallo-dielectric) cavities present an intriguing possibility to circumvent these limitations by combining the strong light-matter interactions of plasmonic systems with the possible large lifetimes (high quality factors) of dielectric structures. Such approaches have been shown to improve the performance of existing applications and allow novel applications for a broad range of examples such as strong light-matter coupling [25][26][27], optical trapping [28], surface-enhanced Raman scattering [29], label-free detection of molecules [30,31], biosensing [32], optoplasmonic sensors [33], or refractometers and nanoparticle trapping [34].…”