Achromatic prism-coupler for planar waveguide

Mendes, Sergio B.; Li, Lifeng; Burke, James J.; Saavedra, S. Scott

doi:10.1016/s0030-4018(96)00694-3

Cited by 10 publications

(23 citation statements)

References 7 publications

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“…Numerous attempts to address the spectral bandwidth problem have been reported but had limited success (29). Mendes reported the first truly successful solutions when he tested two different approaches for achieving achromatic coupling into a single-mode, planar IOW (29,34,35).…”

Section: Broadband Iow-atr Spectroscopymentioning

confidence: 99%

“…In those cases, achromatic incoupling was unsuccessful at wavelengths <500 nm because of the "steep" dispersion of a 7059 glass IOW in this region of the spectrum (29,34,35). In contrast, incoupling white light with the large-NA approach extends the bandwidth down to at least 390 nm; the total bandwidth exceeds 200 nm, twice that of the spectrometers based on achromatic coupling.…”

Section: Broadband Iow-atr Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

Planar Integrated Optical Waveguide Spectroscopy

Bradshaw¹,

Mendes²,

Saavedra³

2005

Anal. Chem.

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Section: Broadband Iow-atr Spectroscopymentioning

confidence: 99%

Section: Broadband Iow-atr Spectroscopymentioning

confidence: 99%

Planar Integrated Optical Waveguide Spectroscopy

Bradshaw¹,

Mendes²,

Saavedra³

2005

Anal. Chem.

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“…The instrument is schematically described in Figure 1. An achromatic waveguide coupler [13,14] was used to efficiently couple an incoming light beam of broad spectral width into the waveguide. The evanescent wave of the propagating mode was employed to probe the absorption properties of a molecular film immobilized on the waveguide surface.…”

Section: Principle Of the Techniquementioning

confidence: 99%

On probing molecular monolayers: a spectroscopic optical waveguide approach of ultra-sensitivity

Mendes¹,

Saavedra²

1999

Opt. Express

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A broadband, multichannel, single-mode, planar waveguide based spectrometer was developed for probing molecular monolayers. A protein sub-monolayer (thickness h @ 3 nm, imaginary part of refractive index kl oe 0.01) immobilized on the waveguide surface was characterized by the waveguide attenuated total reflection (ATR) spectrometer. A sensitivity enhancement of 4 orders of magnitude, compared to conventional transmission measurements, has been experimentally achieved in the characterization of ultra-thin films. In addition, polarized spectroscopic measurements at the TE and TM waveguide modes were implemented to determine the average orientation angle of the adsorbed molecules. The work developed here is a new research tool for the investigation of some fundamental aspects of molecular films and a novel platform to develop new technological devices of high sensitivity and selectivity such as biosensors.

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“…On the other hand, broadband coupling into a single-mode IOW presents challenges due to the dispersive nature of transverse couplers, which must match the effective refractive index of the single-mode waveguide structure. Broadband coupling using a prism coupler, either with an increased angular width of the incoming beam10,13–16 or with an achromatic design,18 have been reported and employed for the spectroscopic interrogation of an adsorbed monolayer. However, prism coupling occurs through an evanescent field, which requires the prism to be placed in close proximity to the waveguiding film, separated by a very small (in the wavelength range) and precisely fixed gap.…”

Section: Introductionmentioning

confidence: 99%

Solid immersion lens at the aplanatic condition for enhancing the spectral bandwidth of a waveguide grating coupler

2010

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We report a technique to substantially boost the spectral bandwidth of a conventional waveguide grating coupler by using a solid immersion cylindrical lens at the aplanatic condition to create a highly anamorphic beam and reach a much larger numerical aperture, thus enhancing the spectral bandwidth of a free-space propagating optical beam coupled into a single-mode planar integrated optical waveguide (IOW). Our experimental results show that the broadband IOW spectrometer thus created almost doubles (94% enhancement) the coupled spectral bandwidth of a conventional configuration. To exemplify the benefits made possible by the developed approach, we applied the technique to the broadband spectroscopic characterization of a protein submonolayer; our experimental data confirm the enhanced spectral bandwidth (around 380-nm) and illustrate the potentials of the developed technology. Besides the enhanced bandwidth, the broadband coupler of the single-mode IOW spectrometer described here is more robust and user-friendly than those previously reported in the literature and is expected to have an important impact on spectroscopic studies of surface-adsorbed molecular layers and surface phenomena.

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Achromatic prism-coupler for planar waveguide

Cited by 10 publications

References 7 publications

Planar Integrated Optical Waveguide Spectroscopy

Planar Integrated Optical Waveguide Spectroscopy

On probing molecular monolayers: a spectroscopic optical waveguide approach of ultra-sensitivity

Solid immersion lens at the aplanatic condition for enhancing the spectral bandwidth of a waveguide grating coupler

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