An optical-fiber-based probe for photonic crystal microcavities
Srinivasan, K.
Barclay, P.E.
Borselli, M.
Painter, O.J.
Dept. of Appl. Phys., California Inst. of Technol., Pasadena, CA, USA;
This paper appears in: Selected Areas in Communications, IEEE Journal on
Publication Date: July 2005
Volume: 23,
Issue: 7
On page(s): 1321- 1329
ISSN: 0733-8716
INSPEC Accession Number: 8513923
Digital Object Identifier: 10.1109/JSAC.2005.851212
Current Version Published: 2005-07-05
Abstract
We review a novel method for characterizing both the spectral and spatial properties of resonant cavities within two- dimensional photonic crystals (PCs). An optical fiber taper serves as an external waveguide probe whose micron-scale field is used to source and couple light from the cavity modes, which appear as resonant features in the taper's wavelength-dependent transmission spectrum when it is placed within the cavity's near field. Studying the linewidth and depth of these resonances as a function of the taper's position with respect to the resonator produces quantitative measurements of the quality factor (Q) and modal volume (Veff) of the resonant cavity modes. Polarization information about the cavity modes can be obtained by studying their depths of coupling when the cavity is probed along different axes by the taper. This fiber-based technique has been used to measure Q∼40,000 and Veff∼0.9 cubic wavelengths in a graded square lattice PC microcavity fabricated in silicon. The speed and versatility of this fiber-based probe is highlighted, and a discussion of its applicability to other wavelength-scale resonant elements is given.
Index
Terms
Available to subscribers and IEEE members.
References
Available to subscribers and IEEE members.
Citing Documents
Available to subscribers and IEEE members.
Cart
