1. |
Integrated circuits as viewed with an acoustic microscope |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 251-253
R. A. Lemons,
C. F. Quate,
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摘要:
The images of a high‐frequency bipolar transistor obtained with an acoustic microscope are compared with those of a differential interference optical microscope and a scanning electron microscope in order to illustrate that the acoustic microscope can be used in a reflection‐type mode to obtain quality pictures of a surface containing integrated circuits. The frequency of the acoustic beam is 600 MHz and the resolution is near 2 &mgr;.
ISSN:0003-6951
DOI:10.1063/1.1655459
出版商:AIP
年代:1974
数据来源: AIP
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2. |
Damage‐induced microdomains in LiTaO3 |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 254-256
J. D. Venables,
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摘要:
Thin wafers of LiTaO3prepared from fully poled boules by mechanical cutting and polishing techniques have been found to contain defects at high concentrations (up to 107/cm2). Examination of these wafers by optical and electron microscope techniques indicates that the defects are cylindrical domains 1–3 &mgr;m in diameter, within which the ferroelectric axis is inverted relative to the surrounding material. These inverted domains appear to have nucleated at screw dislocations,b∥ <0001>, which are observed near the axis of each domain. The results have implications for many applications of LiTaO3, because such multidomain configurations may contribute to undesirable optical scattering, Barkhausen noise, or degraded pyroelectric response. It is suggested also that the permanent optical damage generated in LiTaO3by intense laser radiation may arise in part by the nucleation of similar inverted domains at dislocations generated through the action of large thermal stresses.
ISSN:0003-6951
DOI:10.1063/1.1655460
出版商:AIP
年代:1974
数据来源: AIP
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3. |
Wraparound ASW delay line with lens guidance and monolithic amplification |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 256-258
Jeannine Henaff,
Francis Pirio,
Marc Sinou,
Michel Feldmann,
Michel Le Contellec,
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摘要:
A wraparound acoustic surface wave (ASW) delay line incorporating a periodical &Dgr;&ngr;/&ngr; lens guiding structure and a monolithic InSb amplifier is described. Normal mode computation accounts for parabolic anisotropy. Experimental results on a 120‐MHz recirculating LiNbO3delay line are reported.
ISSN:0003-6951
DOI:10.1063/1.1655461
出版商:AIP
年代:1974
数据来源: AIP
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4. |
Implosion of an unneutralized drifting relativistic electron beam |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 259-260
M. Friedman,
I. M. Vitkovitsky,
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摘要:
A hollow relativistic electron beam, drifting in vacuum, can be made to implode radially when a grounded conductor is placed on the beam axis. The collapse is the result of the change in the direction of the electric field relative to that of a freely propagating beam. The entire energy content of the collapsed beam is dissipated in the conductor.
ISSN:0003-6951
DOI:10.1063/1.1655462
出版商:AIP
年代:1974
数据来源: AIP
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5. |
Surface waves and grating‐tuned photocathodes |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 261-262
J. G. Endriz,
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摘要:
Deposition of an Sl&sngbnd; [Ag&sngbnd;O&sngbnd;Cs] type photocathode onto a diffraction grating substrate has been shown to produce a photoemitter which provides resonant coupling to surface waves and associated significant enhancement in quantum efficiency at preselected frequencies for specified light angle of incidence.
ISSN:0003-6951
DOI:10.1063/1.1655463
出版商:AIP
年代:1974
数据来源: AIP
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6. |
Electrically variable diffraction in spherulitic liquid crystals |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 263-264
Werner E. L. Haas,
James E. Adams,
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摘要:
An electrically controllable diffraction mode in liquid crystals is described. The variable grating is a stable single layer of small uniform birefringent spherulitic domains imbedded in a homeotropic matrix. The size of the domains is changed by small dc or ac voltages.
ISSN:0003-6951
DOI:10.1063/1.1655464
出版商:AIP
年代:1974
数据来源: AIP
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7. |
Electron irradiation experiments in gold with 2.5‐MeV electrons |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 265-267
M. O. Ruault,
B. Jouffrey,
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摘要:
Electron irradiations were performed on six nines purity gold in the 3‐MV electron microscope at Toulouse. Partially ordered vacancy tetrahedra were observed in all of the sample while interstitial loops were formed in its thick parts. Investigation of the nature and cause of the ordering are reported.
ISSN:0003-6951
DOI:10.1063/1.1655465
出版商:AIP
年代:1974
数据来源: AIP
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8. |
Equivalence of the electronically focused acoustic imaging device to a diode convolver |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 267-268
O. W. Otto,
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摘要:
It is demonstrated that the electronically focused acoustic imaging device is equivalent to a diode convolver where the sound image is formed by using the convolver to perform a Fresnel transform of the sound field at the receiving array.
ISSN:0003-6951
DOI:10.1063/1.1655466
出版商:AIP
年代:1974
数据来源: AIP
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9. |
Picosecond x‐ray streak camera |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 268-270
C. F. McConaghy,
L. W. Coleman,
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摘要:
An ultrafast x‐ray‐sensitive streak camera is described. Time resolution is ≈50 psec. A streak record of the x rays from a laser‐produced iron plasma is included.
ISSN:0003-6951
DOI:10.1063/1.1655467
出版商:AIP
年代:1974
数据来源: AIP
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10. |
Analysis of &agr; relaxation in polymers by asymmetrical distribution functions of relaxation times |
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Applied Physics Letters,
Volume 25,
Issue 5,
1974,
Page 270-271
J. Vanderschueren,
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摘要:
The distribution function of relaxation times for the &agr; dispersion in polycarbonate has been calculated from measurements of thermally stimulated discharge currents. This function can be adequately described by the empirical expression of Havriliak and Negami, first derived from the complex plane analysis of ac dielectric data. The values of the distribution parameters obtained from the two types of measurements are in excellent agreement.
ISSN:0003-6951
DOI:10.1063/1.1655468
出版商:AIP
年代:1974
数据来源: AIP
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