Space- and time-resolved spectrophotometry in microsystems.
This work describes a simple optical method for obtaining, in a single still-capture image, the continuous absorbance spectra of samples at multiple locations of microsystems. This technique uses an unmodified bright-field microscope, an array of microlenses, and a diffraction grating to disperse the light transmitted by samples of 10- to 500-microm dimensions. By analyzing in a single image the first-order diffracted light, it is possible to collect the full and continuous absorbance spectra of samples at multiple locations (to a spatial resolution of approximately 8 microm) in microwells and microchannels to examine dynamic chemical events (to a time resolution of <10 ms). This article also discusses the optical basis of this method. The simultaneous resolution of wavelength, time, and space at a scale <10 microm provides additional capabilities for chemical and biological analysis.
Damean
Nicolae
N
Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA.
Sia
Samuel K
SK
Linder
Vincent
V
Narovlyansky
Max
M
Whitesides
George M
GM
D008027:Light; D013053:Spectrophotometry / Q000295:instrumentation* / Q000379:methods*; D013997:Time Factors