An optical device includes a primary nanowire having a predetermined characteristic that affects an optical property of the primary nanowire. At least one secondary nanowire abuts the primary nanowire at a non-zero angle. The secondary nanowire(s) have another predetermined characteristic that affects an optical property of the secondary nanowire(s). A junction is formed between the primary and secondary nanowires. The device is configured to cause a portion of a light beam of a predetermined wavelength or range of wavelengths traveling through one of the primary nanowire or the secondary nanowire(s) to enter another of the secondary nanowire(s) or the primary nanowire.