High energy-efficient UV lamps using nano-thin spectrally selective metallo-dielectric layers

特洛伊技术公司生产的紫外线废水处理系统是一种非常有效和通用的**光学手段，可用于灭活细菌、病毒和寄生虫，如贾第鞭毛虫和隐孢子虫。**目前的商业系统更喜欢使用中压紫外线灯，因为宽带**紫外线发射已被证明是可取的，因为它减少了细菌的光重新激活*。然而，**中压灯工作在800-900摄氏度的较高温度下，从而发出显著的**红外辐射，因此在能量上效率低下。**为了减少这种能量损失并提高灯的效率，需要一种光学涂层，该光学涂层在**UV处理范围(200-320 nm)内传输，同时将红外辐射反射回灯内。通过使用特殊的金属介质涂层可以提高灯的**效率，其中超纳米薄银层**和高带隙陶瓷介质层一起用于最大化红外反射和**光谱的紫外光透射率。**此类结构的初步模拟结果非常有希望，表明**紫外光的高透射率和红外中随波长增加的宽带反射。因此，紫外灯能效的显著**提高被认为是潜在的可行的。**本项目的目标是实验证明这些专门的**金属介质涂层的可行性，以提供节能的紫外灯，并因此将其集成到特洛伊科技的UV废水处理系统的产品线中。**_*光复活是指由于同时**或随后用更长波长的光处理而导致的紫外线辐射造成的生物损害的恢复。

Ultraviolet wastewater treatment systems, produced by Trojan Technologies, are very effective and versatile**optical means for the deactivation of bacteria, viruses, and parasites such as giardia and cryptosporidium.**Current commercial systems prefer the utilization of medium-pressure mecury-vapour lamps since broadband**UV emission has been shown to be desirable given that it reduces photoreactivation* of bacteria. However,**medium-pressure lamps operate at relatively high temperature of 800-900 deg C thereby emitting significant**infrared radiation, and thus are energetically inefficient.**In order to mitigate this energy loss and improve lamp efficiency, an optical coating that transmits in the**UV treatment range (200-320 nm) while reflecting the infrared emission back into the lamp is required. Lamp**efficiency can be improved by using specialized metallo-dielectric coatings wherein ultra-nano-thin Ag layers**and high bandgap ceramic dielectric layers together serve to maximize reflection in the infrared and**transmission in the UV part of the spectrum.**Preliminary modelling results of such structures are quite promising, suggesting high transmission in the**UV and broadband reflection that increases with wavelength in the infrared. Accordingly, significant**enhancement in UV lamp energy-efficiency is deemed potentially viable.**The objective of this project is to experimentally demonstrate the viability of these specialized**metallo-dielectric coatings to render energy-efficient UV lamps, and hence its integration in Trojan**Technologies' product line of UV wastewater treatment systems.**_________*** Photoreactivation is the recovery from biological damage caused by UV radiation as a result of simultaneous**or subsequent treatment with light of longer wavelength.