Micromechanical Photonics - H Ukita Part 12 ppsx

... the medium, H is the height of the sample chamber and D is the distance between the sphere and the wall surface of the chamber. The viscosity µ varies with the temperature T as shown by log 10 µ ... as the Hamaker approximation shown by (5.25) [5.26], where H is the Hamakar constant, a is the radius of the particle, δ is the shortest distance between the particle and the wall. F v = − H...

Ngày tải lên: 10/08/2014, 05:20

... Photograph of the optical encoder. Courtesy of R. Sawada, NTT, Japan GeAsTe LD–PD h1 h2 h0 h Slider a-SiN :H a-SiN :H a-SiN :H Au Substrate Fig. 1.32. A flying optical head with a laser diode. The ... development in these technical fields. The horizontal axis shows miniaturization (size) and the vertical axis shows the number of functions that characterize the optical MEMS /micromechani...

Ngày tải lên: 10/08/2014, 05:20

... suspended. There are two kinds of surface micromachining: photolithography for a thick- ness less than several 10 µm, and electron beam lithography for a thickness of less than 1 µm. Photolithography Photolithography ... with wave- lengths less than that of UV light are irradiated onto electron-sensitive resist, as shown in Fig. 1.5. High-resolution patterning can be accomplished by scan- nin...

Ngày tải lên: 10/08/2014, 05:20

... by the taper-ridged waveguide laser, but also by the highly thermally conductive slider and the re- duction of LD–PD attachment error. Light output is higher for the slider with the higher thermal ... µm, is the sum of the slider flying height h 0 , LD–PD attachment error h 1 (facet-to-slider surface error), and the protective-layer thickness h 2 . Since h 0 =0.9 µmandh 2 =0.24 µm in t...

Ngày tải lên: 10/08/2014, 05:20

... −s below the center of the sphere. In the figure, (a) shows the trapping efficiency for the axial trap (Example 3.4) and (b) that for the transverse trap (Prob- lem 3.4). Both show the maximum when the ... transparent particle whose refractive index is slightly higher than that of the surround- ing medium. Figure 3.8a shows that the focused laser beam illuminates the upper part in a microspher...

Ngày tải lên: 10/08/2014, 05:20

... of the gradient force F g , which always pulls a sphere to the beam axis and the scattering force F s , which always pushes a sphere along the beam axis. Figure 3.23 shows the concept of the horizontal ... of the suspend- ing medium (water), respectively; c is the speed of light, and His the height of the specimen chamber (150 µm). A transversely moving sphere should stably remain near the sp...

Ngày tải lên: 10/08/2014, 05:20

... force of the light intensity in the Rayleigh regime where the size is much less than the wavelength, and also due to the diffractive effect of the light at the sur- face of the object with a size ... 117 Dichromatic mirror (DM) Objective CCD camera Spectroscopic data Q-switch YAG Laser CW YAG Laser Optical fiber Electrochemical measurement OH - OH - OH - OH - D D D H H H y z...

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... resolution is higher than that of the aperture probe because of the smaller radius of the apex. The near-field intensity is much stronger than that of the aperture probe because of the field enhancement ... greater than that along the axial direction. This result shows that the trapped particle is very stable along the transverse direction but unstable along the optical axis, which leads to the...

Ngày tải lên: 10/08/2014, 05:20

... six-layer thin film super-RENS. From these results, we confirm that the Sb-super-RENS has two states; one is due to the change of only mask layer (halfway amorphous), the other due to the change ... see the groove pitch of 1.6 µm with the gold probe. Figure 5.32 shows the rela- tionship between the averaged scattered light intensity and the groove profile. The scattered light with the gold parti...

Ngày tải lên: 10/08/2014, 05:20

... 3 half amorphous, 206 half-wavelength, 51 half-wavelength interval, 40 Halley’s comet, 81 Hamaker approximation, 213 heat-assisted magnetic recording (HAMR), 197 heavy particle, 105 high reflectivity, ... conditions, 152 photolithography, 3, 149 photon tunneling, 117 photopolymerization, 8 photothermal, 26 photothermal deflection, 68 photothermal effect, 20 photothermal excitation, 52 phototherm...

Ngày tải lên: 10/08/2014, 05:20