التفاصيل البيبلوغرافية
| العنوان: |
Detection of Subsurface, Nanometer‐Scale Crystallographic Defects by Nonlinear Light Scattering and Localization. |
| المؤلفون: |
Shafiei, Farbod, Orzali, Tommaso, Vert, Alexey, Miri, Mohammad‐Ali, Hung, Pui Yee, Wong, Man Hoi, Alù, Andrea, Bersuker, Gennadi, Downer, Michael C. |
| المصدر: |
Advanced Optical Materials; 8/18/2021, Vol. 9 Issue 16, p1-8, 8p |
| مصطلحات موضوعية: |
CRYSTAL defects, LIGHT scattering, OPTICAL devices, FILM flow, TRANSMISSION electron microscopy |
| مستخلص: |
Heteroepitaxial crystalline films underlie many electronic and optical technologies but are prone to forming defects at their heterointerfaces. Atomic‐scale defects such as threading dislocations that propagate into a film impede the flow of charge carriers and light degrading electrical/optical performance of devices. Diagnosis of subsurface defects traditionally requires time‐consuming invasive techniques such as cross‐sectional transmission electron microscopy. Using III–V films grown on Si, noninvasive, bench‐top diagnosis of subsurface defects have been demonstrated by optical second‐harmonic scanning probe microscope. A high‐contrast pattern is observed of subwavelength "hot spots" caused by scattering and localization of fundamental light by defect scattering sites. Size of these observed hotspots are strongly correlated to the density of dislocation defects. The results not only demonstrate a global and versatile method for diagnosing subsurface scattering sites but uniquely elucidate optical properties of disordered media. An extension to third harmonics would enable irregularities detection in non‐χ(2) materials making the technique universally applicable. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
