One symmetric and two asymmetric chevron thin films of silver were fabricated by bidepositing oppositely tilted nanorods sequentially via oblique angle deposition. The equivalent electromagnetic parameters of the films for s and p polarizations were retrieved at a wavelength of 639 nm for normal incidence using walk-off and polarization interferometers. Experimental results indicate that the symmetric chevron thin film has the strongest magnetic field reversal among the three different shapes. The coupling of the transverse magnetic field between two separate rods makes the equivalent permeability negative real.
In this work, the chevronic films composed of silver nanorods are fabricated using glancing angle deposition (GLAD).
The chevronic structure is grown by bidepositing opposite nanorods sequentially: the substrate is oriented at the polar
angle Φ=0 deg (about the substrate's normal) for the bottom rods and Φ180 deg for the top rods. When the applied
electric field is parallel to the plane Φ= deg, the induced magnetic dipole moment between nanorods leads to a negative
real part of the equivalent permeability. The equivalent refractive indices, the equivalent permittivities and the equivalent
permeabilities of chevronic films with thickness 230 ± 5 nm for p-polarized light are measured by walk-off
interferometer. The equivalent permeabilities of chevronic films with lengths of top rods 291 nm, 409 and 509 nm and
bottom rods 512 nm, 378 nm and 301 nm are measured to be -2.406+0.443 i, -3.870+2.109 i and -2.126+0.904 i at the
wavelength of 639 nm, respectively. The shape affects the real part of the equivalent permeability significantly. When
the length of the top rods is longer than that of the bottom rods, the magnetic dipole moment between nanorods is
suppressed and the quantity of the equivalent permeability becomes small. The real part of equivalent permeability of the
chevronic film is related to the lengths of top and bottom nanorods.
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