Controllable diamond waveguide tuner

Abstract

An example device in accordance with an aspect of the present disclosure includes a diamond waveguide disposed on a substrate. The substrate includes a dielectric material. A tuner is to extend from the substrate, and is disposed at least in part over the waveguide. The tuner includes a tuner electrode to control a variable distance between the tuner and the waveguide to vary an effective refractive index of the waveguide.

What is claimed is: 
     
         1 . A device comprising:
 a diamond waveguide disposed on a substrate comprised of a dielectric material; and   a tuner extending from the substrate and disposed at least in part over the waveguide, wherein the tuner includes a tuner electrode to control a variable distance between the tuner and the waveguide to vary an effective refractive index of the waveguide.   
     
     
         2 . The device of  claim 1 , wherein the tuner is a cantilever arm that includes a non-biased position toward the waveguide, and the tuner is movable away from the waveguide based on the tuner electrode. 
     
     
         3 . The device of  claim 1 , wherein the tuner is a cantilever arm that includes a non-biased position away from the waveguide, and the tuner is movable toward the waveguide based on the tuner electrode. 
     
     
         4 . The device of  claim 1 , wherein the tuner includes a second tuner electrode, and the tuner is movable based on the second tuner electrode in a direction opposing movement caused by the tuner electrode. 
     
     
         5 . The device of  claim 4 , further comprising a substrate electrode disposed on the substrate corresponding to the tuner electrode, and a second substrate electrode disposed on the substrate corresponding to the second tuner electrode. 
     
     
         6 . The device of  claim 1 , wherein the tuner electrode is disposed on a surface of the tuner facing toward the waveguide. 
     
     
         7 . The device of  claim 1 , wherein the tuner electrode is disposed on a surface of the tuner facing away from the waveguide. 
     
     
         8 . The device of  claim 1 , wherein the tuner electrode is disposed at a tuner electrode layer within the tuner. 
     
     
         9 . The device of  claim 8 , wherein the tuner includes another material having a substantially higher refractive index than the diamond waveguide, to provide a wide range of tuning for the effective refractive index of the waveguide. 
     
     
         10 . The device of  claim 1 , wherein the waveguide comprises a microring disposed between two waveguides to form an add/drop filter. 
     
     
         11 . The device of  claim 1 , wherein the waveguide comprises at least one of a first arm and a second arm of a Mach-Zehnder modulator. 
     
     
         12 . A device comprising:
 a diamond waveguide disposed on a substrate comprised of a dielectric material, wherein the waveguide is a resonator; and   a tuner extending from the substrate and disposed at least in part over the waveguide, wherein the tuner includes a first tuner electrode and a second tuner electrode to control a variable distance between the tuner and the waveguide to vary an effective refractive index of the waveguide.   
     
     
         13 . The device of  claim 12 , wherein the first tuner electrode is to receive a first voltage polarity and is disposed on a first surface of the tuner, and wherein the second tuner electrode is to receive a second voltage polarity opposite the first voltage parity, and is disposed on a second surface of the tuner opposite the first surface. 
     
     
         14 . A method, comprising:
 resonating, by a diamond waveguide disposed on a dielectric substrate, at a first resonant wavelength according to a first effective refractive index of the waveguide;   moving a tuner extending from the substrate and disposed at least in part over the waveguide to control a variable distance between the tuner and the waveguide; and   resonating, by the waveguide, at a second resonant wavelength associated with the variable distance according to a second effective refractive index of the waveguide to achieve optical switching by the waveguide.   
     
     
         15 . The method of  claim 14 , further comprising moving the tuner based on a voltage applied between a tuner electrode disposed on the tuner, and a substrate electrode disposed on the substrate.