close
It's been very cold and rainy, stay warm! Maybe you are also preparing for finals , please make sure to get enough sleep and eat healthy food!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A detailed procedure involving the fabrication of aperture-based near-field optical probes for high-resolution imaging applications is presented. First, one end of a 1 meter-long optical fiber is shaped into a tapered morphology through a chemical etching procedure, and subsequently metal coated under 10-5 Torr vacuum conditions. A smooth metallic aperture rim is defined at the apex of the probe by truncating its conical shape with a focused ion beam. When light is coupled at one end of the fiber a fraction of it ends up exiting through the sub-wavelength sized aperture after passing through the tapered evanescent region. The chemical etching procedure was preferred over the alternative heating and pulling method because the former produces, in general, smaller tapered region (i.e. smaller evanescent region), which renders higher throughput efficiency. Commercially available fibers from different vendors were used to select the one with best performance. A thermally vacuum evaporator was built from scratch, and a semi-automatic operation was implemented. The project exposed opportunities to learn optics, vacuum technology, focused ion beam fabrication, and scanning electron microscopy characterization. The project paves the route for high resolution Raman analysis and high resolution near-field optical microscopy.
We have developed the fabrication of fiber-based near-field optical probes. We have shown that providing a smooth and sharp fiber requires tube etching in HF acid for two hours. It is important to mention that etching process forms taper fibers. To prevent the light from leaking though the sides of the probe requires a thin metal coating on the probe, followed with aperture formation by focused-ion-beam milling. This leads to a NSOM probe with a small dimension aperture to overcome the diffraction-limited resolution that affects far-field optical techniques.
修改了Ｎ次的論文摘要，總算有點初步的雛形了，不過我想這應該還不是最終定案版，畢竟有些照片可能還需要放到機台內重新拍出更佳的照片，還好快耶誕了，只要再撐一下就可以稍微休息一下了。
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A detailed procedure involving the fabrication of aperture-based near-field optical probes for high-resolution imaging applications is presented. First, one end of a 1 meter-long optical fiber is shaped into a tapered morphology through a chemical etching procedure, and subsequently metal coated under 10-5 Torr vacuum conditions. A smooth metallic aperture rim is defined at the apex of the probe by truncating its conical shape with a focused ion beam. When light is coupled at one end of the fiber a fraction of it ends up exiting through the sub-wavelength sized aperture after passing through the tapered evanescent region. The chemical etching procedure was preferred over the alternative heating and pulling method because the former produces, in general, smaller tapered region (i.e. smaller evanescent region), which renders higher throughput efficiency. Commercially available fibers from different vendors were used to select the one with best performance. A thermally vacuum evaporator was built from scratch, and a semi-automatic operation was implemented. The project exposed opportunities to learn optics, vacuum technology, focused ion beam fabrication, and scanning electron microscopy characterization. The project paves the route for high resolution Raman analysis and high resolution near-field optical microscopy.
We have developed the fabrication of fiber-based near-field optical probes. We have shown that providing a smooth and sharp fiber requires tube etching in HF acid for two hours. It is important to mention that etching process forms taper fibers. To prevent the light from leaking though the sides of the probe requires a thin metal coating on the probe, followed with aperture formation by focused-ion-beam milling. This leads to a NSOM probe with a small dimension aperture to overcome the diffraction-limited resolution that affects far-field optical techniques.
修改了Ｎ次的論文摘要，總算有點初步的雛形了，不過我想這應該還不是最終定案版，畢竟有些照片可能還需要放到機台內重新拍出更佳的照片，還好快耶誕了，只要再撐一下就可以稍微休息一下了。
全站熱搜
留言列表
