Abstract
Corner cube retroreflectors (CCRs) have applications in sensors, image processing, free space communication and wireless networks. The ability to construct low-loss wavelength filters embedded in CCRs can enable the development of wavelength multiplexing, tunable lasers and photonic integrated circuits. Here we created an ~10-μm-thick holographic corner cube retroreflector (HCCR) array that acted as a color-selective wavelength filter and diffracted light at broad angles. Angle-resolved spectral measurements showed that the Bragg peak of the diffracted light from the HCCR array could be tuned from 460 to 545 nm by varying the incident angle. The HCCR array also exhibited a wavelength-selective tuning capability based on the rotation angle in the visible spectrum. HCCRs projected holographic images with the rotational property in the far field. The utility of the HCCR was demonstrated as optical temperature and relative humidity sensors that produced a visible colorimetric response for rapid diagnostics.
Highlights
Corner cube retroreflectors (CCRs) consist of three mutually perpendicular intersecting flat surfaces that directly reflect incident light back to its source[1,2]
Unlike the CONCLUSIONS The HCCR array (10 μm thick) has been developed using a simple top-down fabrication approach. This is the first report of planar CCRs and HCCR arrays produced with silver halide chemistry in Denisyuk reflection mode, which can be used for the highly efficient diffraction/ filtering of particular colors depending on the incident angle
The HCCR array is operated based on Bragg diffraction and exhibited reflection properties and additional wavelength-selective filtering compared with CCRs
Summary
Corner cube retroreflectors (CCRs) consist of three mutually perpendicular intersecting flat surfaces that directly reflect incident light back to its source[1,2]. The phase conjugation property of a CCR array has been widely used for wavefront correction and for enhancing the resolution in image processing[6,7]. The phase conjugation property of CCR array surfaces can be utilized in wavefront sensing, phase-conjugated interferometry and Fourier transform holography[8,9,10]. CCRs fabrications are typically based on micromechanical processing or photolithography[13,14,15,16]. These fabrication approaches are costly, expertise dependent and time-consuming, limiting their scalability for practical applications in photonics. The HCCR array does not exhibit all the analogous optical properties when compared with
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