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Polarization-tunable transmission enhancement through DSBE antennas. (a) The angular distribution of transmission enhancement of the DSBE antennas with different intersection angles in polar coordinate at λ = 1.31 μ m. (b) The maximum value of η DSBE with respect to the intersection angles. (c) The normalized and time-averaged |E| intensity distributions around the center of the antennas on the z = 0 plane at λ = 1.31 μ m with Φ = − θ/2.
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Split bull’s eye (SBE) antennas exhibit much larger extraordinary optical transmission and strong polarization dependence rather than bull’s eye (BE) antennas in the infrared range due to the introduced sub-wavelength slit. Here, we demonstrate a dual-split bull’s eye (DSBE) antenna, which consists of two sub-wavelength slits crossing through the c...
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Citations
... The advancement in the lithography process and the possibility to fabricate precise nano-structures using DUV lithography, electron-beam-lithography, and ion-beam milling has intensified the interest. From the first mention of field localization using colloidal gold nanoparticle by Edward Synge [2] to an array of bow-tie antenna [3], highly directive antennas like Yagi-Uda [4] and bull's eye [5] [6], OA technology has advanced exponentially owing to the fabrication capability. The resonator size of an antenna can be of the order of 50 so antenna for IR and visible range are successfully fabricated and implemented, as there is no requirement of high precision sub-nm structures. ...
Single‐Molecule Detection (SMD) has been a hot topic for decades due to its vast implementation in spectroscopy related to biomedical, chemical, physical, and material sciences. The methods used for single‐molecule detection are generally variants of fluorescence and Raman spectroscopy, which employ plasmonic particles for hot spot generation upon illumination. Signal generated by molecules in the hot spot is strong but not directive so in most contemporary works nanomolar concentration is required to suppress noise from background fluorophore molecules for sake of a good signal‐to‐noise ratio (SNR) of the detection. However, at extremely low concentrations, biological samples tend to vary conformation and interaction dynamics, so the most suitable dilution is micromolar. This leads to demand for an optical antenna that can both focus incident light at tight spots and be very directive for the collection of fluorescence with high SNR. Here we propose and simulate a nano‐antenna in the shape of an aluminum hemisphere on a parabolic reflector providing both incident wave enhancement and efficient directive signal outcoupling. To achieve this feat we spatially coincide the focus of the parabolic reflector with the hot spot created by the plasmonic gap antenna. The structure shows broadband (λ=250 to 350 nm) escalation in directivity, 24‐28 dB (depending on wavelength) with beam width as small as 4°. The calculated field enhancement in the detection volume of the plasmonic gap is up to 10⁵. This paper presents an investigation of the hybrid plasmonic–reflector structure providing new pathways for efficient SMD in micromolar concentration.
... The advancement in the lithography process and the possibility to fabricate precise nano-structures using DUV lithography, electron-beam-lithography, and ion-beam milling has intensified the interest. From the first mention of field localization using colloidal gold nanoparticle by Edward Synge [2] to an array of bow-tie antenna [3], highly directive antennas like Yagi-Uda [4] and bull's eye [5] [6], OA technology has advanced exponentially owing to the fabrication capability. The resonator size of an antenna can be of the order of 50 so antenna for IR and visible range are successfully fabricated and implemented, as there is no requirement of high precision sub-nm structures. ...
Single-Molecule Detection (SMD) has been hot-topic for decades due to its vast implementation in spectroscopy related to biomedical, chemical, physics, and material science. The methods used for single-molecule detection are generally variants of Fluorescence and Raman spectroscopy, which employ plasmonic particles for hot spot generation upon illumination by light. Signal generated by molecules in the hot spot is strong but not directive so in most contemporary works nanomolar concentration is required to kill noise from background fluorophore molecules for sake of good signal to noise ratio (SNR) during detection. However, at extremely low concentrations, biological samples tend to vary conformation and interaction dynamics, so most suitable dilution is micromolar for biological material. This leads to demand for an optical antenna that can both focus light at tight spots and be very directive for the collection of fluroscence with high SNR. Our simulated design of nano-antenna using the aluminum hemisphere on parabolic reflector shows broadband (λ=250 to 350 nm ) escalation in directivity, 24-28 dB (depending on wavelength) with beam width as less as〖 4〗^°. The model also enhances light 〖10〗^4-〖10〗^5 (depending on proximity to antenna and dimension of the gap) times in between the gap. To achieve this feat we spatially coincide with the focus of parabolic reflector the point of hot spot created by the plasmonic gap antenna. This paper presents an idea of adding extra features that is a reflector to the existing design of plasmonic antenna like Bow Tie or Dimer nanoantenna, which will enhance their directivity, as well as focusing which will lead to effective SMD in micromolar concentration.
