Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Infrared technology and equipment > Infrared detection,infrared detectors

The subwavelength metal Crossholes structure in the simulation of quantum well infrared photodetector applications

Author WangHengLiang
Tutor AnZhengHua;ShenXueChu
School Fudan University
Course Condensed Matter Physics
Keywords Surface plasmon polaritons Localized surface plasmon Near-field electric field enhancement Fabry - Perot cavity
Type Master's thesis
Year 2011
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Low detection efficiency of the conventional quantum well infrared light detector (QWIP, Quantum Well Infrared Photodetector) subwavelength metal hole micro-structure can improve the light absorption efficiency of the quantum well infrared light detector, thereby improving the detection efficiency of the detector. Contains a large number of free electrons in the metal, which can be coupled with electromagnetic waves, formed in the metal surface the Surface off polaritons (SPP). The electric field of surface plasmon polaritons localized at the surface of the metal, with the distance away from the metal exponential decay. The metal hole structure can inspire Surface away from the the polaritons unique optical properties. Such as: enhanced transmission, optical antenna, negative refraction, fluorescence enhancement. Surface plasmon polaritons before a hot research direction of the scientific community. The main structure of subwavelength metal Micronanoelectronic structure excitation and control of surface plasmon polaritons. Of surface plasmon polaritons in metal micro-and nano-photonic devices can not only improve the performance of conventional devices, but would also produce some novel physical phenomena and new device features. In this paper, a the periodic subwavelength metal cross hole array near-field electric field enhancements. We use the finite-difference time-domain (FDTD) method to simulate the optical properties of a series of periodic subwavelength metal cross hole arrays. 1) light (front) incident from the air - metal - quantum well material, study of surface plasmon polaritons (SPP), localized surface plasmon (LSR), enhanced transmission (EOT). The study found to be able to adjust the incident light, and so on polaritons from the coupling between polaritons structure, surface away from for a long time to maintain the photon - electron resonance localized surface plasmon photon resonance life . 2) light from the quantum well material - metal - air (back) incident, the metal holes through the study of surface plasmon polaritons localized surface plasmon Fabry - Paros (FP ) cavity, the relationship between the electric field enhancement of the near-field. The metal is thin, although the same incident on the backside incident reflection spectrum with positive reflection spectra, but the backside incident near-field electric field enhancement than positive incident transmission enhancement stronger. In the back-illuminated structure, We use the metal - the side of the quantum well of the light, so the metal can become very thick. 3) for the back of the incident, the light transmission to the air will not be with the electrons in the quantum well coupled, so we designed single-ended opening cross hole metal grating structure to study the surface plasma polaritons, Bureau the domain surface plasmon, the relationship between Fabry Palo cavity, near-field electric field enhancement in the quantum well, a high electric field component, able to increase the coupling efficiency of electronic and photonic quantum well . The method of subwavelength periodic metal pore structure of these studies, also applicable to the study of the different structures of the coupling grating.

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