ISSN Online: 2377-424X
ISBN Print: 978-1-56700-421-2
International Heat Transfer Conference 15
Tailoring Radiative Property of Two-Dimensional Complex Grating Structures
Аннотация
Tailoring radiative properties (e.g., reflectance, transmittance, and absorptance) using engineered nanostructures has been intensively studied due to its potential impacts on various applications, such as biosensing, thermophotovoltaic and photovoltaic energy conversions, and nano-manufacturing. Existing studies have mainly focused on one-dimensional (1-D) or two-dimensional (2-D) simple grating structures for simplicity in modeling
and manufacturing. In the present study, we systemically investigate the spectral reflectance of dielectriclayered
metallic substrate on top of which 2-D metallic complex grating exists. A complex grating can be views as geometrical combination of two grating elements with different sizes. In order to identify various resonance modes, such as surface plasmon polariton, magnetic polariton, and cavity resonance existing in complex gratings, the finite-difference time-domain method is employed in solving Maxwell's equation. Differently
from 2-D simple grating structures, we can observe the multiple magnetic polariton modes associated
with different grating elements in a single unit cell. Furthermore, surface plasmon will also be branched out
into multiple modes due to combination of two grating elements. These characteristics of 2-D complex grating
will be best suited for achieving broad-band emission or absorption, which is critical for energy harvesting
applications.