High performance midinfrared narrow-band plasmonic thermal emitter

Abstract

The blackbody radiation spectrum is fundamental to any thermal emitter. However, by properly designing the emitter structure, a narrow bandwidth and high power infrared source can be achieved. This invention consists of a triple layer structure by sandwiching a dielectric SiO 2 layer between two Ag metal films on the Si substrate. The top Ag layer is perforated by periodic holes. When the device was heated, the background thermal radiation was suppressed by the bottom Ag whose emissivity is very low. The thermal radiation generated in the SiO 2 layer resonant between two metal films and the Ag/ SiO 2 and the Ag/air surface plasmon polaritons are induced and converted to light radiation. Strong resonance at Ag/ SiO 2 ͑1,0͒ degenerate modes results in the coherent light radiation at the wavelength associated with the dielectric constant of SiO 2 and the lattice constant of the perforated hole array. The ratio of the full width at half maximum to the peak wavelength is 0.114. This narrow bandwidth and high power infrared light source can be used to explore the biological response of cells and plants.

Metamaterial Electromagnetic Wave Absorbers

“…[ 21 , 22 ] This last design, in particular, is very similar to some metamaterial fi shnet designs that were later used as MPAs; it generally consists of a periodic hole array over a continuous ground plane surrounding a dielectric. [ 21 ] However, the goal of this progress report will be to focus on the more traditional MPAs, as will be discussed in Section 3. Section 6 will briefl y overview similar MPA geometries that were utilized for emitters.…”

“…For periodic boundaries, a plane wave with a certain polarization is launched onto the structure and all fi elds and currents are forced to be identical at the boundaries of the simulation space. All simulation settings mentioned output the complex scattering parameters, such as the transmission coeffi cient, S 21 , and refl ection coeffi cient, S 11 , from which R ( ω ) and T ( ω ) can be obtained as T ( ω ) = | S 21 | 2 and R ( ω ) = | S 11 | 2 , respectively; here, the fi rst subscript denotes the receiving port and the second subscript denotes the excitation port. Therefore, in computational investigations of the MPA, the amplitudes of the refl ection coeffi cient S 11 and the transmission coeffi cient S 21 are the most utilized parameters.…”

Light extinction and scattering from individual and arrayed high-aspect-ratio trenches in metals

“…This trend is driven, amongst others, by the emergence of fabricational capabilities allowing for the fabrication of trenches with a high degree of precision and with sizes necessary for resonances in the visible and near infrared. Such capabilities enable the use of gratings of various types for sensing [11][12][13], thermal emission [14,15], etc. While the mechanism has been elucidated from several angles, the scattering strength of an ideal or perfect metallic slit possesses several characteristics that, under certain circumstances, make it an ideal dipolar scatterer for the scattering of freely propagating waves.…”

Life enrichment for workers in contemporary China

“…Chuang Zi advocates freedom to live one's life to the fullest. Instead of rigidly following the social norms or seeking wealth or power, Chuang Zi advises everyone to let go of their inner struggles tied to the material world and simply follow one's heart (Tsai et al, 2006). To live one's own desires, create a boundaryless world for enrichment and happiness that would otherwise be unattainable.…”