Characterization of light collection through a subwavelength aperture from a point source
We experimentally measure and theoretically model the light transmission characteristics of subwavelength apertures. The characterization consists of translating a point source at varying vertical height and lateral displacement from the aperture and measuring the resulting transmission. We define t...
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Published in | Optics express Vol. 14; no. 22; pp. 10410 - 10425 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
30.10.2006
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Abstract | We experimentally measure and theoretically model the light transmission characteristics of subwavelength apertures. The characterization consists of translating a point source at varying vertical height and lateral displacement from the aperture and measuring the resulting transmission. We define the variation of the transmission with lateral source displacement as the collection mode point spread function (CPSF). This transmission geometry is particularly relevant to subwavelength aperture based imaging devices and enables determination of their resolution. This study shows that the achieved resolutions degrade as a function of sample height and that the behavior of sensor devices based on the use of apertures for detection is different from those devices where the apertures are used as light sources. In addition, we find that the measured CPSF is dependent on the collection numerical aperture (NA). Finally, we establish that resolution beyond the diffraction limit for a nominal optical wavelength of 650 nm and nominal medium refractive index of 1.5 is achievable with subwavelength aperture based devices when the aperture size is smaller than 225 nm. |
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AbstractList | We experimentally measure and theoretically model the light transmission characteristics of subwavelength apertures. The characterization consists of translating a point source at varying vertical height and lateral displacement from the aperture and measuring the resulting transmission. We define the variation of the transmission with lateral source displacement as the collection mode point spread function (CPSF). This transmission geometry is particularly relevant to subwavelength aperture based imaging devices and enables determination of their resolution. This study shows that the achieved resolutions degrade as a function of sample height and that the behavior of sensor devices based on the use of apertures for detection is different from those devices where the apertures are used as light sources. In addition, we find that the measured CPSF is dependent on the collection numerical aperture (NA). Finally, we establish that resolution beyond the diffraction limit for a nominal optical wavelength of 650 nm and nominal medium refractive index of 1.5 is achievable with subwavelength aperture based devices when the aperture size is smaller than 225 nm. |
Author | Heng, Xin Wu, Jigang Cui, Xiquan Yang, Changhuei Knapp, David W Psaltis, Demetri Yaqoob, Zahid McDowell, Emily J |
Author_xml | – sequence: 1 givenname: Xin surname: Heng fullname: Heng, Xin email: xin@caltech.edu organization: Department of Electrical Engineering (MC136-93), California Institute of Technology, Pasadena, CA 91125, USA. xin@caltech.edu – sequence: 2 givenname: Xiquan surname: Cui fullname: Cui, Xiquan – sequence: 3 givenname: David W surname: Knapp fullname: Knapp, David W – sequence: 4 givenname: Jigang surname: Wu fullname: Wu, Jigang – sequence: 5 givenname: Zahid surname: Yaqoob fullname: Yaqoob, Zahid – sequence: 6 givenname: Emily J surname: McDowell fullname: McDowell, Emily J – sequence: 7 givenname: Demetri surname: Psaltis fullname: Psaltis, Demetri – sequence: 8 givenname: Changhuei surname: Yang fullname: Yang, Changhuei |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/19529440$$D View this record in MEDLINE/PubMed |
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