Bojin Lin, Hnin Lai Lai Aye, Daiki Yoshikawa, Yoshihiro Ishitani
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引用次数: 0
摘要
在 430 - 630 K 的温度范围内,利用未掺杂 (u-) GaAs、u-GaP、u-ZnO、u-GaN 和 n 型 SiC 上的表面金属半导体光栅结构,获得了 8.5 - 28 THz 频率区域的红外热辐射发射。这些发射与纵向光学 (LO) 声子或 LO 类晶格振动能量共振,这些能量由表面结构中介电常数实部的零点决定。雷斯特拉伦带宽为几十厘米-1 的材料的发射显示出与其 LO 声子模式共振的发射,而带宽超过 170 厘米-1 的材料则显示出明显低于 LO 声子的峰值能量:类 LO 声子共振。辐射强度受辐射和非辐射 LO 或 LO 类声子湮灭率平衡的影响。辐射率由 LO-声子-辐射相互作用哈密顿和玻色-爱因斯坦因子主导。u-ZnO上的结构具有强烈的LO-类声子辐射相互作用,因此发射强度很高。不同材料的发射强度与温度和发射窗口宽度的关系表明,与材料有关的金属/半导体界面条件对发射效率有影响。
Impact of material-dependent radiation – longitudinal optical phonon interaction on thermal electric-dipole radiation from surface metal − semiconductor grating structures
Infrared thermal radiation emission in the 8.5 – 28 THz frequency region is obtained using surface metal–semiconductor grating structures on undoped (u-) GaAs, u-GaP, u-ZnO, u-GaN, and n-type SiC in a temperature range of 430 – 630 K. These emissions resonate with longitudinal optical (LO) phonon or LO-like lattice vibration energies determined by the zero points of the real parts of the dielectric functions in the surface structures. The emissions of materials with Reststrahlen bandwidths of a few tens of cm−1 show the emissions resonating with their LO phonon modes, while materials with bandwidth of more than 170 cm−1 show peak energies significantly lower than the LO phonon: LO-like phonon resonance. The emission intensity is found to be dominated by the balance of radiative and nonradiative LO or LO-like phonon annihilation rates. The radiative rate is dominated by the LO-phonon–radiation interaction Hamiltonian and the Bose-Einstein factor. High emission intensity is obtained for the structure on u-ZnO with intense LO-like phonon–radiation interaction. The dependence of the emission intensity on temperature and emission window width for various materials shows the effect of material-dependent metal/semiconductor interface conditions on the emission efficiency.
期刊介绍:
The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region.
Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine.
Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.