metallic nanoparticles boundary element method (mnpbem) toolbox  (MathWorks Inc)

Journal: Nature Communications

Article Title: Nanoelectromechanical modulation of a strongly-coupled plasmonic dimer

doi: 10.1038/s41467-020-20273-2

Figure Lengend Snippet: a Schematic of the device showing how an external DC bias applied to Au actuators can electrostatically pull two Si 3 N 4 beams together and reduce the spacing between two Au nanoparticles. b False-colored STEM image of the fabricated dimer (white/yellow) and cantilevers (brown). White, dashed rectangle indicates the location of the dimer. Scale bar: 1 μm. c, d Simulated EELS spectra as a function of gap size for the electron beam incident on the left edge ( c ) and the center ( d ) of gold nanodisk dimer. We apply an increasing 1 step (5 step) offset values to each of the left (center) EELS intensity spectra for improved visibility. The red and blue symbols indicate the location of BDP and ADP modes, respectively. e Magnified false-colored STEM image of gold nanodisk dimer. The diameter and thickness of gold nanodisk are designed to be 100 nm and 50 nm, respectively. Scale bar: 200 nm. f Simulated EELS spatial profile of BDP and ADP modes for the gap size of 2 nm. White dashed contour extracted from STEM image (Fig. 1e) has been taken into account in the EELS simulation.

Article Snippet: The EELS simulations are performed using the Metallic NanoParticles Boundary Element Method (MNPBEM) toolbox for MATLAB , .

Techniques:

Journal: Nature Communications

Article Title: Nanoelectromechanical modulation of a strongly-coupled plasmonic dimer

doi: 10.1038/s41467-020-20273-2

Figure Lengend Snippet: a Schematic of the light intensity modulation experiment. b Resonant dark-field scattering spectra taken from the dimer when there is only a 1.5-nm-thick EBID spacer layer separating the two Au nanoparticles (red curve) and for the case of a 30 nm spacing (blue curve). For clear comparison, two different offsets of 0.15 and −0.35 are applied to the red and blue spectra, respectively. The magenta and gray dashed lines indicate the photon energies of the CW excitation on resonance (1.27 eV) and off resonance (1.91 eV), respectively. The triangular symbols indicate the resonance frequencies of each mode at 1.5 nm (red) and 30 nm (blue) gap sizes. c Time-modulated intensity signal from dimer with the 1.5-nm-EBID spacer as measured by time-correlated single-photon counting. Line plots indicate the averaged intensity in each 4-ns-wide time bin (1000 data points within each 4 ns bin). To allow easy comparison, an offset of 8 kcounts is applied to the modulated intensity for 1.91 eV laser illumination.

Article Snippet: The EELS simulations are performed using the Metallic NanoParticles Boundary Element Method (MNPBEM) toolbox for MATLAB , .

Techniques: Comparison

Journal: Nature Communications

Article Title: Nanoelectromechanical modulation of a strongly-coupled plasmonic dimer

doi: 10.1038/s41467-020-20273-2

Figure Lengend Snippet: a Schematic of the device showing how an external DC bias applied to Au actuators can electrostatically pull two Si 3 N 4 beams together and reduce the spacing between two Au nanoparticles. b False-colored STEM image of the fabricated dimer (white/yellow) and cantilevers (brown). White, dashed rectangle indicates the location of the dimer. Scale bar: 1 μm. c, d Simulated EELS spectra as a function of gap size for the electron beam incident on the left edge ( c ) and the center ( d ) of gold nanodisk dimer. We apply an increasing 1 step (5 step) offset values to each of the left (center) EELS intensity spectra for improved visibility. The red and blue symbols indicate the location of BDP and ADP modes, respectively. e Magnified false-colored STEM image of gold nanodisk dimer. The diameter and thickness of gold nanodisk are designed to be 100 nm and 50 nm, respectively. Scale bar: 200 nm. f Simulated EELS spatial profile of BDP and ADP modes for the gap size of 2 nm. White dashed contour extracted from STEM image (Fig. 1e) has been taken into account in the EELS simulation.

Article Snippet: The EELS simulations are performed with the Metallic NanoParticles Boundary Element Method (MNPBEM) toolbox for MATLAB, which solves Maxwell’s equations in the presence of an electron beam (see Methods for details).

Techniques:

Journal: Nature Communications

Article Title: Nanoelectromechanical modulation of a strongly-coupled plasmonic dimer

doi: 10.1038/s41467-020-20273-2

Figure Lengend Snippet: a Schematic of the light intensity modulation experiment. b Resonant dark-field scattering spectra taken from the dimer when there is only a 1.5-nm-thick EBID spacer layer separating the two Au nanoparticles (red curve) and for the case of a 30 nm spacing (blue curve). For clear comparison, two different offsets of 0.15 and −0.35 are applied to the red and blue spectra, respectively. The magenta and gray dashed lines indicate the photon energies of the CW excitation on resonance (1.27 eV) and off resonance (1.91 eV), respectively. The triangular symbols indicate the resonance frequencies of each mode at 1.5 nm (red) and 30 nm (blue) gap sizes. c Time-modulated intensity signal from dimer with the 1.5-nm-EBID spacer as measured by time-correlated single-photon counting. Line plots indicate the averaged intensity in each 4-ns-wide time bin (1000 data points within each 4 ns bin). To allow easy comparison, an offset of 8 kcounts is applied to the modulated intensity for 1.91 eV laser illumination.

Article Snippet: The EELS simulations are performed with the Metallic NanoParticles Boundary Element Method (MNPBEM) toolbox for MATLAB, which solves Maxwell’s equations in the presence of an electron beam (see Methods for details).

Techniques: Comparison