SCANNING NEAR FIELD ULTRASOUND HOLOGRAPHY

Vinayak Dravid (Inventor), Gajendra S Shekhawat (Inventor)

Research output: Patent

Abstract

Nanoscale Subsurface Imaging via Scanning Near-Field Ultrasound Holography NU 2003-061, 2010-051 Inventors Gajendra S. Shekhawat* Vinayak P. Dravid Short Description A novel nondestructive imaging method (SNFUH) providing nanoscale spatial resolution as well as depth information for embedded structural features. #MEDICAL DEVICE#imaging #RESEARCH TOOL#equipment #RESEARCH TOOL#method Abstract There is an increasing need for nondestructive high-resolution imaging of various "buried" nano/micro-structures in scientific research and nano/micro-manufacturing process. To fill this critical void, a novel acoustic holography technology, known as the scanning near-field ultrasound holography (SNFUH), has been developed at Northwestern to provide nondestructive real-space imaging of embedded features with nanoscale lateral resolution and depth sensitivity. This invention is based on a unique integration of scanning probe microscope (SPM) platform coupled to microscale ultrasound source with novel detection and holography techniques. The ultrasound wave needed for this imaging technology is generated during the thermal expansion of the samples that absorb the coherent laser beam provided. Significantly outperforming alternative approaches (e.g. AFM) in imaging resolution, SNFUH is equally amenable to hard (e.g. semiconductor), soft (e.g. polymers and biological system), and hybrid materials. This promising technology offers a versatile tool for numerous imaging and structure detection applications in physical sciences, engineered systems, and biology. Applications o Nondestructive nanoscale imaging of buried features in engineered systems, such as packaged nano/micro-electronics, o High resolution imaging of 3D nano/micro structures (hard, soft or hybrid material systems), o Nondestructive nanoscale imaging of inside structures of biological systems, such as cells, o Nondestructive detection of internal structural defects at nanoscale. Advantages o Nano-scale spatial resolution o Nondestructive, real-space imaging o Amenable to different material systems o Providing depth information Publications G. S. Shekhawat and V.P. Dravid, "Nanoscale Imaging of Buried Structures via Scanning Near-Field Ultrasound Holography", Science 2005, Vol. 310 no. 5745 pp. 89-92, DOI: 10.1126/science.1117694 IP Status Issued US patents No. 7,798,001, No. 7,448,269 and No. 8,316,713 Marketing Contact Arjan Quist, PhD Invention Associate (p): 847-467-0305 (e): arjan.quist@northwestern.edu
Original languageEnglish
Patent number7798001
StatePublished - Sep 21 2010

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