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標題: | 具多波長/偏振選擇特性之可攜式窄頻紅外光熱發射器與應用 Portable Infrared Thermal Emitter with Narrowband/Selectable Multi-wavelength/Polarization Characteristic and Applications |
作者: | Wei-Lun Huang 黃偉倫 |
指導教授: | 李嗣涔 |
關鍵字: | 窄頻紅外光,表面電漿子,侷域型表面電漿,多波長發射,可攜式紅外光熱輻射器,嗅覺,自旋殘留信息理論, Narrow bandwidth Infrared,Plasmonic,Localized Surface Plasmon,Multi-Wavelength Emission,Portable Infrared Thermal Emitter,Olfactory,Spin-Residual information theory, |
出版年 : | 2018 |
學位: | 博士 |
摘要: | 本論文實現了一具有多波長發射與可選擇偏極化特性之可攜式紅外光熱輻射發射器。第一種類型的多波長紅外光發射器是利用相互耦合的侷域型表面電漿子模式所實現。通過實驗和有限差分時域模擬方法研究了金屬/電介質/金屬結構中的垂直和橫向侷域型表面電漿子共振模態。在具有簡單金屬光柵的三層金屬/電介質/金屬結構中引入周期性佈置的混合電介質材料,可實現多波長的侷域型表面電漿子紅外光發射器。橫向侷域型表面電漿子電場會往高折射率的區域集中,複合式侷域型表面電漿子的電場分布,類似於周期性排列的混合電介質層中的駐波模態,每個模態即對應不同階數的紅外光峰值。共振波長可藉由改變混合介電材料的組成與頂部金屬光柵的線寬來調變,也研究了紅外光元件的非色散發光和偏振特性。
在波導型熱輻射發射器的介電共振腔內引入一嵌入式金屬光柵,實現第二種類型的多波長紅外光發射器,其具有波長和偏振的高選擇性。兩個相互極化正交的波導共振模式,其電場分佈於介電共振腔內的不同區域。實驗量測的結果非常吻合有限差分時域分析的模擬結果。共振波長可藉由改變嵌入金屬條的週期,線寬,或位置來調變,也研究了多波長元件熱輻射發光頻譜的角度色散與極化特性。本論文實現了具極化與波長可選擇性的可攜式紅外光發射器,裝置的體積和重量分別為190×40×35立方公釐和235克。其可替換不同波長的紅外光晶片可用於不同應用。紅外光晶片通過由9伏特鋰電池輸入直流電流加熱至攝氏200℃操作溫度,其溫度可分別由電流控制器和外部數字顯示器調節和監控。不同極化方向的紅外光調變可藉由旋轉安裝在發射端口上的線偏振片來實驗。 本論文將窄頻紅外光應用於探討人類嗅覺理論的實驗。氣味分子中的鍵結振動可以被具有特定波長的紅外光照射所激發,利用受到激發的分子鍵結震動研究對人體嗅覺的影響。嗅覺實驗中採用具有碳-氫和碳-氧鍵結的檸檬醛和環十五烷酮的氣味分子,照射光源採用波長為3.5微米和5.8微米的窄頻紅外光。通過分析23個受試者的嗅覺實驗結果,顯示受到紅外光照射激發的分子鍵結振動確實影響了相當數量受試者所感受到的氣味變化。本論文研究結果支持”殘留自旋信息”理論,於吸收了紅外光的分子鍵結側的殘留光子自旋,其帶有的自旋信息才是產生與改變人類嗅覺意識的主因。 A portable infrared thermal emitter with multi- wavelength emission and selectable polarization characteristics was realized in this thesis. The first type of multi- wavelength infrared thermal emitter was achieved by utilizing the mutually coupled localized surface plasmon (LSP) modes. The vertical and the lateral LSP resonant modes in the metal/dielectric/metal (MDM) structure were investigated by the experimental and the simulated (finite-difference time-domain analysis, FDTD) methods. A multi-wavelength emission LSP infrared thermal emitter was achieved by introducing a periodic arrangement of hybrid dielectric materials with a simple metallic grating in a tri-layer metal/dielectric/metal structure. The lateral LSP fields were concentrated in the regions with high effective refractive index. The fields of the multiple LSP modes exhibit distribution patterns similar to that of a standing wave in the periodic arrangement of the hybrid dielectric layer, each of which presents an emission peak corresponding to a different modal order. The resonant wavelengths can be adjusted by altering the compositions of hybrid dielectric materials as well as the line width of top metallic grating. The non-dispersive emission and polarization characteristics of the device were studied. The second type of multi-wavelength infrared thermal emitter with high selectivity of wavelengths and polarizations was achieved by introducing an embedded metal grating inside the dielectric resonant cavity of a waveguide thermal emitter. The electric fields of the waveguide modes with two orthogonal polarizations are distributed in different regions of the cavity. The measured experiments agree well with the simulation results of FDTD analysis. Resonant wavelengths can be adjusted by altering the period, the metallic line width, or the position of the embedded metallic strips. The angular dependence, the polarization characteristics, and the thermal radiation spectra of the multi-wavelength WTEs were investigated. A portable infrared emitter with selectable polarization and wavelength is realized. The volume and weight of the equipment is 190×40×35 mm3 and 235 g, respectively. The IR emitter chip with different emission wavelength is replaceable for different applications. The IR emitter chip is operated in a temperature of 200°C by an input DC electrical current supporting from a 9V lithium battery. The temperature of the IR chip can be adjusted and monitored by the current controller and the outer digital displayer, respectively. Switchable polarization emission has been realized by rotating a linear polarizer mounted on the emission port. The narrow bandwidth infrared light sources were applied in the study of human olfactory theory. The bonding vibration in the odorant molecules could be excited by infrared light with specific wavelength. The effect of the excited molecular bonding vibration on the olfaction of human was studied. The odorant molecules of citral and cyclopentadecanone, which has C-H and C=O bonds, were adopted in the olfactory experiments. The narrow bandwidth infrared light with emission wavelength of 3.4 μm and 5.8 μm were utilized in the olfactory experiments. By analyzing the olfactory experimental results of 23 human subjects, the molecular bonding vibration excited by infrared illumination does affect the smell variations felt by a non-negligible number of subjects. This study supports the “residual spin information” theory that the residual photonic spins left near the sites of molecular-bonds which absorbed the photons contribute to the olfactory sense. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/71798 |
DOI: | 10.6342/NTU201804294 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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