這是今年三月份的Optics and Photonics News的主題及封面.(OPN, Vol.21(3),March 2010).記得我剛開使玩Optical Tweezers時,都還寫著"過去20年.....一種新的技術....."轉眼間就變40年啦:P(當然要看對Optical Tweezers的開始的定義是何時,還有40年可能有點灌水啦,時間是沒過那麼快啦:P).....而這個NEWS,還要感謝四月份參加好友及學妹婚禮時(郭郭喜宴),同學林老大告訴我的.....
網頁連結:
以下是這篇報導的圖啦....看看有沒有似曾相似的喔~~~
Fig.1 Artist’s interpretation of a DNA strand held under tension by two beads trapped in optical tweezers.
Fig.2 A simple optical tweezers system. The laser input into the system is from the left hand side, indicated by the red line. L1 and L2 form a beam-expanding telescope, as do L3 and L4. Note the system is in a horizontal geometry, in contrast with many optical tweezers that sit in a vertically positioned microscope. The illumination for the sample is provided by a simple white light LED.
Fig.3 Optical sorting.
Fig. 4 Optical stretching. A cell is trapped between two counter-propagating beams in a dual-beam fiber trap. The laser wavelength used is 1,064 nm. (Top) With low laser power of 200 mW, the cell has no measureable deformation. (Bottom) However, at higher powers of 1.4 W, the cell is appreciably stretched. The amount of stretching is linked to the properties of the cytoskeleton.
Fig.5 Optical injection of a gold nanoparticle into a cell. The nanoparticle is first trapped by continuous wave optical tweezers. Once in position at the surface of the cell, a pulsed femtosecond beam is applied; this forces the cell through the cell membrane.
Fig.6 The aerosol carousel. Five aerosol water droplets are trapped in a ring. The droplets can be rotated, using holographic optical tweezers, to move through the “interrogation zone” denoted by the dashed box on the left-hand side. Here a Raman spectra is taken (right-hand image) and can be used to analyze the droplet composition as well as to gain information on its size. Using this technique, one can make comparative measurements between the different droplets
另有幾個有趣的Reference:
References and Resources
若要pdf檔也可以跟我要,我已經下載了.
p.s.突然想問,我這樣貼圖會不會有侵犯著作權的問題啊:P
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