کنفرانس مهندسی برق ایران

صفحه اصلی / سی و یکمین کنفرانس بین المللی مهندسی برق

Simulation of Two Metal- Semiconductor- Metal Photodetectors for Sensing Power and Angle of Incident Light

نویسندگان :

Shakila Karami¹ Maryam Khodadai² Nosrat Granpayeh³

1- دانشگاه صنعتی خواجه نصیرالدین طوسی 2- دانشگاه صنعتی شیراز 3- دانشگاه صنعتی خواجه نصیرالدین طوسی

کلمات کلیدی :

Angle of incident light،Coupled Mode Theory،Photodetectors،Sensing power

چکیده :

Photodetectors convert the optical signal into a proportional electrical current. Because of the vector nature of light, it is appropriate for the photodetectors to be able to determine the power and angle of the radiant light. In this paper, two metal-semiconductor-metal photodetectors that together can measure both the power and incident angle of light are analyzed. Each of these photodetectors is made of a silicon nanowire placed by thin gold tubes on a silicon oxide substrate. Examination of the absorption spectrum reveals that resonance occurs at some wavelengths of visible light, so because of the short distance between the two nanowires, similar resonant modes are coupled. These modes operate according to the coupling mode theory. Assuming light illumination on the structure, the angle of incident light is obtained from the relationship between the ratio of energy stored in nanowires, the parameters from the coupled mode theory, the wavelength of resonant mode, the wavelength of radiant light, and the distance between photodetectors. On the other side, the total power is obtained by summing the amount of power absorbed in each nanowire. These simple and extremely small light sensors extract more information from the environment and could become pervasive in next-generation smart optoelectronic and artificial intelligence systems for instance imaging devices, 3D positioning, autonomous vehicles, and in robotics