Infrared Localized Surface Plasmon Resonances on Subwavelength Corrugated Metal Disks

Bulgakova, Vladislava V; Gerasimov, V. V.; Lemzyakov, A. G.; Milekhin, Ilya

doi:10.1109/irmmw-thz.2018.8510230

Cited by 3 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The advantage of densely packed structures lies in red shifting the LSPRs relative to the diffraction lobes' onset point that improves the angular stability of the resonances [35]. Furthermore, in the case of closely spaced disks, new strong plasmon modes can be excited due to hybridizing the EM fields of nearby disks [19,36]. The results of simulating the transmittance spectra for the closely spaced spiral disks with a 135 • C-resonator and δr = 35 µm covered with photoresist films of different thicknesses are shown in Figure 6a.…”

Section: Asymmetric Spiral Disks With Shifted Centermentioning

confidence: 99%

“…For the efficient confinement of the surface mode on the structure, the period of grooves at the outer radius R must be much less than the radiation wavelength in the air: G = 2π R/n << λ 0 , where n is a total number of grooves. Lately, numerical simulations in the THz region for a periodic structure of azimuthally grooved golden disks on dielectric substrates [18][19][20][21] showed that high-order (multipole) electric and magnetic LSPRs can be excited under oblique illumination or when combining the grooved disk with a C-shaped resonator. As compared to dipole resonances, the multipole ones have higher Q-factors and are more sensitive to the presence of dielectric materials on the structure, i.e., more promising for sensing applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing

et al. 2020

View full text Add to dashboard Cite

In this paper, we studied the sensing performance of metasurfaces comprised by spiral-disk-shaped metallic elements patterned on polypropylene substrates, which exhibited localized surface plasmon resonances in the low-frequency region of the terahertz (THz) spectrum (0.2–0.5 THz). Optimal designs of spiral disks with C-shaped resonators placed near the disks were determined and fabricated. The experimentally measured transmittance spectra of the samples coated with very thin photoresistive layers (d ~ 10−4–10−3 λ) showed good agreement with the simulations. The resonance frequency shift Δf increases with increasing d, while saturating near d = 50 µm. The narrow-band magnetic dark modes excited on symmetrical spiral disks with a 90° C-resonator demonstrated very high figure of merit (FOM) values reaching 1670 (RIU·mm)−1 at 0.3 μm thick analyte. The hybrid high order resonances excited on asymmetrical densely packed spiral disks showed about two times larger FOM values (up to 2950 (RIU·mm)−1) compared to symmetrical distantly spaced spirals that resembled the best FOM results found in the literature for metasurfaces fabricated with a similar technique. The demonstrated high sensing performance of spiral disks is evaluated to be promising for bio-sensing applications in the THz range.

show abstract

Section: Asymmetric Spiral Disks With Shifted Centermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The advantage of densely packed structures lies in red-shifting the LSPRs relative to the diffraction lobes onset point that improves angular stability of resonances [35]. Furthermore, in case of closely spaced disks, new strong plasmon modes can be excited due to hybridizing the EM fields of nearby disks [19,36]. The results of simulating the transmittance spectra for closely spaced spiral disks with a 135⁰-C-resonator and δr = 35 µ m covered with photoresist films of different thicknesses are shown in Figure 6(a).…”

Section: Asymmetric Spiral Disks With Shifted Centermentioning

confidence: 99%

“…For efficient confinement of the surface mode on the structure, the period of grooves at the outer radius R must be much less than the radiation wavelength in air: G = 2 R/N << 0, where N is a total number of grooves. Lately, numerical simulations in the THz region for a periodic structure of azimuthally grooved golden disks on dielectric substrates [18][19][20][21] showed that high order (multipole) electric and magnetic LSPRs can be excited under oblique illumination or when combining the grooved disk with a C-shaped resonator. As compared to dipole resonances, the multipole ones have higher Q-factors and are more sensitive to the presence of dielectric materials on the structure, i.e.…”

Section: Introductionmentioning

confidence: 99%

Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing

Gerasimov¹,

Hafizov²,

Kuznetsov³

et al. 2020

Preprint

View full text Add to dashboard Cite

In this paper, we study the sensing performance of metasurfaces comprised by spiral-disk-shaped metallic elements patterned on polypropylene substrates, which exhibit localized surface plasmon resonances in the low-frequency region of the THz spectrum (0.2-0.5 THz). Optimal designs of spiral disks with C-shaped resonators placed near the disks were determined and fabricated. The experimentally measured transmittance spectra of samples coated with very thin photoresistive layers (d ~ 10-4-10-3 λ) showed good agreement with simulations. The resonance frequency shift Δf increases with increasing d, while saturating near d = 50 µm. The narrow-band magnetic dark modes excited on symmetrical spiral disks with a 90⁰-C-resonator demonstrated very high FOM values reaching 1670 [RIU·mm]-1 at 0.3μm-thick analyte. The hybrid high order resonances excited on asymmetrical densely packed spiral disks showed about two times larger FOM values (up to 2950 [RIU·mm]-1) as compared to symmetrical distantly spaced spirals that resembles the best FOM results found in literature for metasurfaces fabricated with a similar technique. The demonstrated high sensing performance of spiral disks is evaluated to be promising for bio-sensing applications in the THz range.

show abstract

Studying localized surface plasmon resonances in the THz region for subwavelength spiral disks

Gerasimov

Kuznetsov

Lemzyakov

et al. 2020

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Spoof localized surface plasmon resonances (LSPRs) in the THz range are promising for bio-sensing and spectroscopy. Using long spiral grooves allows improving the surface mode confinement of LSPRs in the long-wavelength region. Our numerical simulations of sub-wavelength spiral gold disks in the range of 0.04–6 THz have shown that in case of Drude conductivity and normal incidence of EM radiation only the first- and second-order dipole localized surface plasmon resonances (LSPRs) are excited. High order resonances arise at inclined incidence. The spectra and 2D distributions of the EM field at the resonant frequencies depend on the number of spiral arms and symmetry of the spiral structure.

show abstract

Infrared Localized Surface Plasmon Resonances on Subwavelength Corrugated Metal Disks

Cited by 3 publications

References 3 publications

Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing

Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing

Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing

Studying localized surface plasmon resonances in the THz region for subwavelength spiral disks

Contact Info

Product

Resources

About