Momentum space design of highQ photonic crystal optical cavities
CaltechAUTHORS
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Title 
Momentum space design of highQ photonic crystal optical cavities


Creator 
Srinivasan, Kartik
Painter, Oskar 

Subject 
Caltech Library Services


Description 
The design of high quality factor (Q) optical cavities in two dimensional photonic crystal (PC) slab waveguides based upon a momentum space picture is presented. The results of a symmetry analysis of defect modes in hexagonal and square host photonic lattices are used to determine cavity geometries that produce modes which by their very symmetry reduce the vertical radiation loss from the PC slab. Further improvements in the Q are achieved through tailoring of the defect geometry in Fourier space to limit coupling between the dominant momentum components of a given defect mode and those momentum components which are either not reflected by the PC mirror or which lie within the radiation cone of the cladding surrounding the PC slab. Numerical investigations using the finitedifference timedomain (FDTD) method predict that radiation losses can be significantly suppressed through these methods, culminating with a graded square lattice design whose total Q approaches 105 with a mode volume of approximately 0.25 cubic halfwavelengths in vacuum.


Publisher 
Optical Society of America


Date 
20020729


Type 
Article
PeerReviewed 

Format 
application/pdf


Identifier 
http://authors.library.caltech.edu/276/1/SRIoe02.pdf
Srinivasan, Kartik and Painter, Oskar (2002) Momentum space design of highQ photonic crystal optical cavities. Optics Express, 10 (15). pp. 670684. ISSN 10944087. http://resolver.caltech.edu/CaltechAUTHORS:SRIoe02 <http://resolver.caltech.edu/CaltechAUTHORS:SRIoe02> 

Relation 
http://resolver.caltech.edu/CaltechAUTHORS:SRIoe02
http://authors.library.caltech.edu/276/ 
