Laser Ablated Nanocrystalline Diamond Membrane for Infrared Applications

Abstract

We are reporting on laser microstructuring of thin nanocrystalline diamond membranes, for the first time. To demonstrate the possibility of microstructuring, we fabricated a diamond membrane, of 9 μm thickness, with a two-dimensional periodic array of closely located chiral elements. We describe the fabrication technique and present the results of the measurements of the infrared transmission spectra of the fabricated membrane. We theoretically studied the reflection, transmission, and absorption spectra of a model structure that approximates the fabricated chiral metamembrane. We show that the metamembrane supports quasiguided modes, which appear in the optical spectra due to grating-assisted diffraction of the guided modes to the far field. Due to the C4 symmetry of this structure, it demonstrates circular dichroism in transmission. The developed technique can find applications in infrared photonics since diamond is transparent at wavelengths >6 μm and has record values of hardness. It paves the way for creation of new-generation infrared filters for circular polarization.

Combined HF+MW CVD Approach for the Growth of Polycrystalline Diamond Films with Reduced Bow

“…Although single-crystal diamond is preferred for effective heat sinks, it remains a high-priced material, with principal limitations on the size of high-quality crystals that are well below the standards for the electronic industry [18][19][20]. So, much more inexpensive and potentially wider-sized polycrystalline diamond (PCD) films and plates are usually used instead [21][22][23][24][25]. Such material is composed of smaller 10-100 µm-sized diamond grains, which still have a negative effect on the thermal conductivity of PCD material in comparison with single-crystal material [26,27].…”

Optical Pump–Terahertz Probe Diagnostics of the Carrier Dynamics in Diamonds

“…In particular, micrometer-thin diamond membranes can be produced for various applications such as masks for X-ray lithography, MEMS, pressure sensors, etc. [ 23 , 24 , 25 , 26 ]. In addition, in the process of CVD synthesis, various micro- and nanoparticles can be embedded in the bulk of diamond layers [ 27 ], which can lead, for example, to the formation of highly X-ray luminescent diamond membranes [ 28 ].…”

Laser-Induced Graphitization of Diamond Under 30 fs Laser Pulse Irradiation

“…H ighly localized and geometrically confined structural transformations in diamond with intrinsic sp 3 diamond's tetrahedral phase converted into an sp 2 -rich graphitic fraction employing a laser light have been shown to significantly enhance light absorption in the irradiated areas and to open a new avenue for the emerging opto-photonic applications, including miniaturized thermionic solar cells, 1 broad-beam light detectors, 2,3 and most recently, robust broad-beam polarization filters for infrared (IR) applications. 4 These applications, however, may only become technologically accomplishable once the thermal stresses associated with laser processing and the formation of sp 2 fraction on the surface or in the bulk of the diamond crystal, are minimized while remaining spatially confined. Additionally, owing to a close lattice match between diamond's sp 3 tetrahedral fraction and the planar two-dimensional (2D) graphene and graphite structures, direct fabrication of "graphene-on-diamond" heterostructures by means of an in situ sp 3 -to-sp 2 conversion enables development of a variety of robust ultrawide bandgap "all carbon" optoelectronic devices in a single-step fabrication process, without resorting to processes that normally require high-temperature annealing with a metal catalyst.…”

“…Highly localized and geometrically confined structural transformations in diamond with intrinsic sp 3 diamond’s tetrahedral phase converted into an sp 2 -rich graphitic fraction employing a laser light have been shown to significantly enhance light absorption in the irradiated areas and to open a new avenue for the emerging opto-photonic applications, including miniaturized thermionic solar cells, broad-beam light detectors, , and most recently, robust broad-beam polarization filters for infrared (IR) applications . These applications, however, may only become technologically accomplishable once the thermal stresses associated with laser processing and the formation of sp 2 fraction on the surface or in the bulk of the diamond crystal, are minimized while remaining spatially confined.…”