Dark GPC

Andrew Rafael Banas, Mark Jayson Villangca, Darwin Palima, Jesper Glückstad

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Generalized Phase Contrast (GPC) is an efficient method for efficiently shaping light into speckle-free contiguous optical distributions useful in diverse applications such as static beam shaping, optical manipulation and recently, for excitation in two-photon optogenetics. GPC typically results in a 3x intensified user defined input mask shape against a dark background. In this work, we emphasize GPC’s capability of optimal destructive interference, normally used to create the dark background surrounding the shaped light. We also study input parameters wherein the locations of light and darkness are interchanged with respect to typical GPC output, thus resulting to a well-defined structured darkness. The conditions that give destructive interference for the output are then applied to near-arbitrary shapes. Preliminary experimental results are presented using dynamic spatial light modulator to form scaled arbitrary darkness shapes. Supporting demonstrations that reverse the light and dark regions of amplitude-modulated input are also presented as a related case of structuring destructive interference. Our analysis and experimental demonstrations show a simplified approach in the generation of extended regions of destructive interference within coherent beams. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Original languageEnglish
Title of host publicationProceedings of SPIE
EditorsJesper Glückstad, David L. Andrews, Enrique J. Galvez
Number of pages6
PublisherSPIE - International Society for Optical Engineering
Publication date2016
Article number97640H-1
Publication statusPublished - 2016
EventComplex Light and Optical Forces X - The Moscone Center, San Francisco, California, United States
Duration: 13 Feb 201618 Feb 2016


ConferenceComplex Light and Optical Forces X
LocationThe Moscone Center
CountryUnited States
CitySan Francisco, California


  • Spatial filtering
  • Fourier optics
  • Generalized Phase Contrast
  • Phase modulation
  • Laser beam shaping

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