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鍍膜是用物理或化學(xué)的方法在材料表面鍍上一層透明的電解質(zhì)膜,或鍍一層金屬膜,目的是改變材料表面的反射和透射特性。在可見(jiàn)光和紅外線(xiàn)波段范圍內(nèi),大多數(shù)金屬的反射率都可達(dá)到78%~98%,但不可高于98%。無(wú)論是對(duì)于CO2激光,采用銅、鉬、硅、鍺等來(lái)制作反射鏡,采用鍺、砷化鎵、硒化鋅作為輸出窗口和透射光學(xué)元件材料,還是對(duì)于YAG激光采用普通光學(xué)玻璃作為反射鏡、輸出鏡和透射光學(xué)元件材料,都不能達(dá)到全反射鏡的99%以上要求。不同應(yīng)用時(shí)輸出鏡有不同透過(guò)率的要求,因此必須采用光學(xué)鍍膜方法。對(duì)...
干法刻蝕技術(shù)*,在芯片制造的過(guò)程中,硅片表面圖形的形成主要依靠光刻和刻蝕兩大模塊。光刻的目的是在硅片表面形成所需的光刻膠圖形,刻蝕則緊接其后地將光刻膠的圖形轉(zhuǎn)移到襯底或襯底上的薄膜層上。隨著特征尺寸要求越來(lái)越小,對(duì)光刻和刻蝕的要求也越來(lái)越高。通常一個(gè)刻蝕工藝包含以下特性:良好的刻蝕速率均勻性(Uniformity),不僅僅是片內(nèi)的均勻性(WithinWafer),還包括片與片之間(WafertoWafer),批次與批次之間(LottoLot)。高選擇比(HighSelecti...
Thispageintendstopresentthedifferentmajortechniquesusedinmicrofabricationtoetchamaterialsothatthelayeryou'vedepositedwilllettheshapeyouwantedappear.Etchingisalargeenoughsubjecttowriteawholeencyclopediaaboutit.Ijustwanttoshowthemaindifferenc...
Thispagetalkaboutthedifferentwaystodepositmaterialsinmicrotechnology(referedtowithbarbarianwordssuchaslpcvd,sputtering,evaporation-thermalande-beam,pecvdetc.).Itisnotatallexhaustive,butcorrespondstowhatIknow!Itisenoughtounderstandhowhighist...
Lithographyisthestepthatallowsthedefinitionofthepatternonthesubstrate:thankstoapolymerresist,andusingaradiationsexposure,itfabricatesamaskabovethematerialtobepatterned.Itisacriticalsteptogettheshapesofthemicrostructures,eitherinMEMSormicroe...
Lift-offprocessinmicrostructuringtechnologyisamethodofcreatingstructures(patterning)ofatargetmaterialonthesurfaceofasubstrate(ex.wafer)usingasacrificialmaterial(ex.Photoresist).Itisanadditivetechniqueasopposedtomoretraditionalsubtractingtec...