Abstract

The interference from Rayleigh and other elastic scattering is a serious intrinsic problem of Raman spectroscopy. This is especially the case with multichannel Raman spectroscopy, in which the spectrometer slits have to be widely opened so that they transmit the dispersed light of the whole spectral region to be detected. The standard multichannel Raman spectrometer therefore adopts a specially designed triple polychromator equipped with a subtractive double-grating filter. This type of polychromator is rather elaborate and needs careful handling because of complicated optical arrangements that include three gratings and at least six mirrors. The throughput of the filter is as low as a few tens of percent and this causes a difficulty if one needs to detect extremely weak light signals, say, in time-resolved resonance Raman spectroscopy. A high-effeciency line-elimination optical filter would solve these problems. Recently, Flaugh <i>et al.</i> demonstrated that a crystalline colloidal array of monodisperse polystyrene spheres was useful for that purpose. In this paper, we propose a simple and convenient line-elimination filter which utilizes an extremely sharp absorption of a <i>J</i>-aggregate of an organic dye molecule.

Continuously tunable optical filter for use in resonance Raman spectroscopy

David W. Collins, Robert E. Cookingham, and Aaron Lewis
Appl. Opt. 16(1) 252-254 (1977)

Narrowband multichannel filters and integrated optical filter arrays

Zhanshan Wang, Tian Sang, Li Wang, Hongfei Jiao, Yonggang Wu, Jingtao Zhu, Lingyan Chen, Shao-Wei Wang, Xiaoshuang Chen, and Wei Lu
Appl. Opt. 47(13) C1-C8 (2008)

Elimination of residual amplitude modulation in tunable diode laser wavelength modulation spectroscopy using an optical fiber delay line

Arup Lal Chakraborty, Keith Ruxton, Walter Johnstone, Michael Lengden, and Kevin Duffin
Opt. Express 17(12) 9602-9607 (2009)

Electronically tunable coherent Raman spectroscopy using acousto-optics tunable filter

Georgi I. Petrov, Zhaokai Meng, and Vladislav V. Yakovlev
Opt. Express 23(19) 24669-24674 (2015)

I₂-vapor notch filter with optical multichannel detection of low-frequency-shift inelastic scattering from surface-enhanced Raman-scattering active electrodes

Kevin F. Wall and Richard K. Chang
Opt. Lett. 11(8) 493-495 (1986)