Open AccessFlexible silicon sensors for diffuse reflectance spectroscopy of tissue
Author(s) -
Donald S. Miller,
N.M. Jokerst
Publication year - 2017
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.8.001512
Subject(s) - materials science , diffuse reflectance infrared fourier transform , silicon , diffuse reflection , monte carlo method , optics , curvature , crosstalk , photodiode , optoelectronics , spectroscopy , fabrication , chemistry , physics , pathology , medicine , biochemistry , statistics , mathematics , geometry , alternative medicine , photocatalysis , quantum mechanics , catalysis
Diffuse reflectance spectroscopy (DRS) is being used in exploratory clinical applications such as cancer margin assessment on excised tissue. However, when interrogating nonplanar tissue anomalies can arise from non-uniform pressure. Herein is reported the design, fabrication, and test of flexible, thin film silicon photodetectors (PDs) bonded to a flexible substrate designed for use in conformal DRS. The PDs have dark currents and responsivities comparable to conventional Si PDs, and were characterized while flat and while flexed at multiple radii of curvature using liquid phantoms mimicking adipose and malignant breast tissue. The DRS and nearest neighbor crosstalk results were compared with Monte Carlo simulations, showing good agreement between simulation and experiment.