Scattering Metal Waveguide Based Speckle-Enhanced Prism Spectrometry

Sakir Kaan Cetindag, Muhammed Fatih Toy, Onur Ferhanoglu*, Fehmi Civitci

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We present an optical efficiency improved speckle spectrometer where a scattering metal wave-guide is utilized along with a conventional prism spectrometer. We conducted extensive tests on 25 different scatterers, involving a variety of nanoparticle concentrations, scattering layer thicknesses, and wave-guide vs. non-guiding type scatterers. We observed 35 pm spectral resolution at 1.3% optical efficiency, which we could only achieve with ∼0.01% optical efficiency using a conventional non-guiding scatterer. Thus our new implementation provides up to two orders of magnitude improvement in optical efficiency at the same spectral resolution, as opposed to scatterers that are not sandwiched between metal plates. The improvement in optical efficiency allows for rapid (∼5 μsec exposure) acquisition of the spectrum with a conventional CMOS camera. Thanks to its excellent spectral resolution and diminished optical losses, the proposed spectrometer could be utilized in high frame-rate, real time spectrum reconstruction applications, such as Optical Coherence Tomography.

Original languageEnglish
Article number8930923
Pages (from-to)2022-2027
Number of pages6
JournalJournal of Lightwave Technology
Issue number7
Publication statusPublished - 1 Apr 2020

Bibliographical note

Publisher Copyright:
© 1983-2012 IEEE.


This work was supported by the Scientific and Technological Research Council ofTurkeyTUBITAKunderGrant 116F142. Manuscript received June 24, 2019; revised October 14, 2019 and November 27, 2019; accepted December 2, 2019. Date of publication December 11, 2019; date of current version April 1, 2020. This work was supported by the Scientific and Technological Research Council of Turkey TUBITAK under Grant 116F142. (Corresponding author: Onur Ferhanog˘lu.) S. K. Çetindag˘ is with the Department of Electronics and Communication Engineering, Istanbul Technical University, Istanbul 34469, Turkey, and also with IMEC, 3001 Leuven, Belgium (e-mail: [email protected]).

FundersFunder number
Scientific and Technological Research Council
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu116F142


    • Optical waveguides
    • optoelectronic and photonic sensors
    • spectroscopy


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