Effects of nanoscale features on infrared radiative properties of heavily doped silicon complex gratings

作     者：HSU PeiFeng 

作者机构：Department of Mechanical and Aerospace EngineeringFlorida Institute of Technology 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2010年第53卷第8期

页      面：2207-2214页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

主　　题：cavity resonance effect finite-difference time-domain modified complex gratings radiative property surface plasmon polaritons 

摘      要：The infrared radiative properties of one heavily doped silicon complex grating and its corresponding four modified complex gratings with attached features at transverse magnetic wave incidence were numerically investigated by employing the finite-difference time-domain *** the complex grating,by properly choosing the carrier concentration and geometry,it exhibited a broadband absorptance peak at wavelengths between 7 and 12μm resulting from the excitation of surface plasmon *** for the four modified complex gratings,though absorptance spectra of the gratings almost remained unchanged, their locations shifted towards longer ***,the spectral absorptance peaks of two modified complex gratings were wider than that of the grating without attached *** broadened peaks could be partly attributed to the cavity resonance within the grating structures demonstrated by the electromagnetic fields and Poynting vectors ***,through comparing the spectral absorptances of complex gratings with two symmetrical square features in three sizes,it was shown that the peak wavelength shifted toward longer wavelengths with enlarged feature *** work theoretically laid a foundation for the optimized design and application of the infrared detector with high performance.