Thin film transistor manufacturing method and thin film transistor

A method of manufacturing a thin film transistor, said method comprising:

• forming a semiconductor thin film on a transparent substrate;
• forming a first insulation film having refractive index n1 and film thickness d1 on said semiconductor thin film;
• forming a gate electrode on said first insulation film;
• implanting dopant into said semiconductor thin film;
• forming a second insulation film having refractive index n2 and film thickness d2 in a way to cover said first insulation film and said gate electrode;
• and
• activating said implanted dopant by applying a laser with wavelength λ;
• wherein said film thicknesses d1 and d2 are of sufficient thickness to cause said laser to be reflected off of the gate electrode and to be absorbed by said thin film transistor away from said gate electrode, and
• wherein said thickness d1 and d2 fall in a range satisfying a set of the Formulae (5) and (6) when m and m1 are any given positive integers:
• abs{d2*n2−2*m*λ/4}<λ/8 (5);
• and
• abs{(d2*n2+d1*n1)−(2*m1−1)*λ/4}<λ/8 (6).