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Surface plasmon enhancement of photon extraction efficiency by silver nanoparticles: with applications in laser cooling of semiconductors

机译:银纳米颗粒增强表面等离子体激元提取光子的效率:在半导体激光冷却中的应用

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摘要

Laser cooling of materials has been one of the important topics of photonic research during recent years. This is due to the compactness, lack of vibration, and integratibility of this method. Although laser refrigeration has been achieved in rare earth doped glass, no net cooling of semiconductors has been observed yet. The main challenge in this regard is the photon trapping inside the semiconductors, due to its high refractive index, which prevents the extraction of the energy from the material. Various methods have been proposed to overcome photon trapping but they are either not feasible or introduce surface defects. Surface defects increase the surface recombination which absorbs some portion of the photoluminescence and converts it to heat. We exploit the surface plasmons produced in silver nanoparticles to scatter the PL and make the extraction efficiency significantly higher without increasing the surface recombination. This is also important in the semiconductor lighting industry and also for enhancing the performance of solar cells by coupling the sunlight into the higher index absorbing region. Finite difference time domain simulations were used to find the total power extraction efficiency of the silver nanoparticles. It is also proposed for the first time to use the silver nanoparticles as mask for dry etching. The results for both etched and unetched cases were compared with each other. We also refer to a method of silver nanoparticle fabrication which is easy to apply to all kinds of cooling targets and is relatively cheaper than deposition of complex anti-reflective coatings.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
机译:近年来,材料的激光冷却一直是光子研究的重要课题之一。这是由于该方法的紧凑性,缺乏振动和可集成性。尽管已在掺稀土玻璃中实现了激光制冷,但尚未观察到半导体的净冷却。在这方面的主要挑战是光子由于其高折射率而被捕获在半导体内部,这阻止了从材料中提取能量。已经提出了各种方法来克服光子俘获,但是它们要么不可行,要么引入表面缺陷。表面缺陷增加了表面重组,吸收了一部分光致发光并将其转化为热量。我们利用在银纳米颗粒中产生的表面等离子体来分散PL,并在不增加表面重组的情况下使提取效率显着提高。这在半导体照明行业中也很重要,对于通过将太阳光耦合到较高折射率吸收区域中来增强太阳能电池的性能也很重要。时域有限差分模拟用于发现银纳米粒子的总功率提取效率。还首次提出使用银纳米颗粒作为用于干法蚀刻的掩模。将刻蚀和未刻蚀情况的结果相互比较。我们还提到了一种银纳米粒子的制造方法,该方法易于应用于各种冷却目标,并且比沉积复杂的抗反射涂层要便宜。©(2012)COPYRIGHT光电仪器工程师协会(SPIE)。摘要的下载仅允许个人使用。

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