Patent ID: 7147918

Claim:
A microfabricated diamond element wherein at least one columnar body of a quadrangular cross section comprising diamond is formed on a substrate, and wherein lengths of a long side and a short side in the cross section of the columnar body satisfy relational expressions represented by Formulae (1) and (2) below; C 1 =2 a √{square root over (1+ k 2 )} (1) nλ≈C 1 (2) C 1 : a distance [nm] of a lap in a situation where light generated inside the columnar body goes around on a specific circuit while being reflected on side faces of the columnar body, n: an arbitrary positive integer, λ: an emission peak wavelength [nm] of the diamond, a: the length of the long side [nm], and k: a ratio of the length of the short side to the length of the long side.