THz imaging systems of this type will have other uses too, where noninvasive measurement or imaging of concealed structures is necessary, such as in semiconductor manufacturing or in ex vivo bioimaging.īecause of its unique properties, imaging and analysis with terahertz (THz) radiation have attracted much attention in recent years ( 1– 3). With subwavelength resolution and the inherent sensitivity to local conductivity, it is possible to detect fissures in the circuitry wiring of a few micrometers in size. Using this technique, we image a printed circuit board on the underside of a 115-μm-thick silicon wafer with ~100-μm (λ/4) resolution. Knowledge of the patterns and of the corresponding detector signal are combined to give an image of the object. An unknown object is placed on the hidden side of the silicon, and the far-field THz transmission corresponding to each mask is recorded by a single-element detector. We project a time-varying, intense (>100 μJ/cm 2) optical pattern onto a silicon wafer, which spatially modulates the transmission of synchronous pulse of THz radiation. ![]() We demonstrate noninvasive, near-field THz imaging with subwavelength resolution. However, because of the long wavelengths of THz radiation (λ = 400 μm at 0.75 THz), far-field THz imaging techniques suffer from low resolution compared to visible wavelengths. ![]() Terahertz (THz) imaging can see through otherwise opaque materials.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |