DBR 다공성 실리콘의 광학적 특성을 이용한 바이오분자의 감지

Abstract

Distributed Bragg reflector (DBR) porous silicon (PSi) exhibiting unique reflectivity was successfully obtained by an electrochemical etching of silicon wafer using square current waveform. A biosensor was described an optical interferometric transducer scheme based on inexpensive and readily available optically flat thin films of DBR PSi. The system was probed with various fragments of an aqueous C-reactive protein (CRP) analyte. This CRP is so named because it is able to affect precipitation of somatic C-polysaccharide of Streptococcus pneumonia. The sensor operated by measurement of the reflection peak in the white light reflection spectrum from the porous silicon layer. Molecular binding was detected as a shift in wavelength of reflection peaks.