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Extracting surface wave-coupled emission with subsurface dielectric gratings
Optics Letters
|August 1, 2014
Summary
Researchers developed a novel subsurface dielectric grating to extract surface plasmon-coupled emission (SPCE) and Bloch surface wave-coupled emission (BSWCE) into free space. This compact method enables tunable, directional fluorescence, advancing optical devices.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Conventional surface plasmons (SPs) and Bloch surface waves (BSWs) exhibit wave vectors exceeding that of light in vacuum, hindering direct emission coupling into free space.
- Existing methods for coupling surface plasmon-coupled emission (SPCE) and Bloch surface wave-coupled emission (BSWCE) into free space, such as prisms or oil-immersion objectives, are bulky and limit miniaturization.
- The need for compact and efficient methods for directional fluorescence emission is critical for advanced optical systems and devices.
Purpose of the Study:
- To experimentally demonstrate a new, miniaturized method for extracting SPCE and BSWCE into free space.
- To investigate the use of a subsurface dielectric grating for directional fluorescence emission.
- To explore the tunability of emission direction and patterns by controlling grating parameters.
Main Methods:
- Fabrication of a chip-like substrate with a decorated subsurface dielectric grating.
- Experimental demonstration of fluorescence emission extraction using the fabricated structure.
- Characterization of the directional fluorescence emission and its dependence on grating period and dimensionality.
Main Results:
- Successfully demonstrated free-space directional fluorescence emission from the chip-like substrate with a subsurface dielectric grating.
- Verified that the decorated substrate enables efficient coupling of SPCE/BSWCE into free space.
- Showcased the ability to tune the emitting direction and patterns by altering the grating's period size and dimensionality.
Conclusions:
- The subsurface dielectric grating offers a novel, cost-effective, and compact strategy for realizing free-space directional fluorescence emission.
- This method overcomes the limitations of bulky optical components, paving the way for miniaturized optical systems.
- The developed technique has significant potential for applications in fluorescence-based sensing, imaging, LEDs, and optical displays.
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