title: Tunable Optical Performances on a Periodic Array of Plasmonic Bowtie Nanoantennas with Hollow Cavities.
abstract: We propose a design method to tune the near-field intensities and absorption spectra of a periodic array of plasmonic bowtie nanoantennas (PBNAs) by introducing the hollow cavities inside the metal nanostructures. The numerical method is performed by finite element method that demonstrates the engineered hollow PBNAs can tune the optical spectrum in the range of 400-3000 nm. Simulation results show the hollow number is a key factor for enhancing the cavity plasmon resonance with respect to the hotspot region in PBNAs. The design efforts primarily concentrate on shifting the operation wavelength and enhancing the local fields by manipulating the filling dielectric medium, outline film thickness, and hollow number in PBNAs. Such characteristics indicate that the proposed hollow PBNAs can be a potential candidate for plasmonic enhancers and absorbers in multifunctional opto-electronic biosensors.
authors.affiliation: Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, BE1410, Negara Brunei Darussalam.
authors.forename: Yuan-Fong
authors.initials: YF
authors.lastname: Chou Chau
authors.affiliation: Department of Physics, Fu Jen Catholic University, New Taipei City, Taiwan.
authors.forename: Chung-Ting
authors.initials: CT
authors.lastname: Chou Chao
authors.affiliation: Department of Electronic Engineering, Chien Hsin University of Science and Technology, No. 229, Jianxing Rd, Zhongli City, Taoyuan County, 32097, Taiwan.
authors.forename: Jhin-Yu
authors.initials: JY
authors.lastname: Rao
authors.affiliation: Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, 202, Taiwan. hpchiang@mail.ntou.edu.tw.|Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan. hpchiang@mail.ntou.edu.tw.
authors.forename: Hai-Pang
authors.initials: HP
authors.lastname: Chiang
authors.affiliation: Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, BE1410, Negara Brunei Darussalam.
authors.forename: Chee Ming
authors.initials: CM
authors.lastname: Lim
authors.affiliation: Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, BE1410, Negara Brunei Darussalam.
authors.forename: Ren Chong
authors.initials: RC
authors.lastname: Lim
authors.affiliation: Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, BE1410, Negara Brunei Darussalam.
authors.forename: Nyuk Yoong
authors.initials: NY
authors.lastname: Voo
keywords: Cavity plasmon resonance; Finite element method; Hollow number; Plasmonic bowtie nanoantennas