Abstract
One critical factor for bolometer sensitivity is efficient electromagnetic heating of thermistor materials, which plasmonic nanogap structures can provide through the electric field enhancement. In this report, using finite element method simulation, electromagnetic heating of nanorod dimer antennas with a nanogap filled with vanadium dioxide (VO2) was studied for long-wavelength infrared detection. Because VO2 is a thermistor material, the electrical resistance between the two dimer ends depends on the dimer’s temperature. The simulation results show that, due to the high heating ability of the nanogap, the temperature rise is several times higher than expected from the areal coverage. This excellent performance is observed over various nanorod lengths and gap widths, ensuring wavelength tunability and ultrafast operating speed, thereby making the dimer structures a promising candidate for high sensitivity bolometers.
Highlights
One critical factor for bolometer sensitivity is efficient electromagnetic heating of thermistor materials, which plasmonic nanogap structures can provide through the electric field enhancement
A dielectric material that is grown by atomic layer deposition (ALD) comprises the gap material, and the gap width defined by the dielectric thickness can be sub-10 nm with Ångström resolution, maximizing the field enhancement factor[8,9,10,11,17,18]
We investigated the absorption and the field enhancement in the V O2 nanogap to reveal the mechanism of the excellent bolometer performance and demonstrated resonance tuning and ultrafast pulse detection by changing the nanorod length and the gap width
Summary
One critical factor for bolometer sensitivity is efficient electromagnetic heating of thermistor materials, which plasmonic nanogap structures can provide through the electric field enhancement. The simulation results show that, due to the high heating ability of the nanogap, the temperature rise is several times higher than expected from the areal coverage This excellent performance is observed over various nanorod lengths and gap widths, ensuring wavelength tunability and ultrafast operating speed, thereby making the dimer structures a promising candidate for high sensitivity bolometers. We conducted finite element method simulation to calculate electromagnetic heating of the gold nanorod dimer with a V O2 nanogap in the long-wavelength infrared (LWIR) range which is the most important range for bolometers designed to detect room temperature objects[3,21]. We investigated the absorption and the field enhancement in the V O2 nanogap to reveal the mechanism of the excellent bolometer performance and demonstrated resonance tuning and ultrafast pulse detection by changing the nanorod length and the gap width
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