Exhibit 99.1
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D originally filed on January 17, 2012 (including amendments thereto) with respect to the shares of Common Stock, par value $0.001 per share, of Derma Mattson Technology, Inc. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.
| Dated: January 17, 2012 | POTOMAC CAPITAL PARTNERS II, L.P. | |
| By: | Potomac Capital Management II, L.L.C. | |
| General Partner | ||
| By: | /s/ Paul J. Solit | |
| Name: | Paul J. Solit | |
| Title: | Managing Member | |
| POTOMAC CAPITAL MANAGEMENT II, L.L.C. | ||
| By: | /s/ Paul J. Solit | |
| Name: | Paul J. Solit | |
| Title: | Managing Member | |
| POTOMAC CAPITAL PARTNERS L.P. | ||
| By: | Potomac Capital Management, L.L.C. | |
| General Partner | ||
| By: | /s/ Paul J. Solit | |
| Name: | Paul J. Solit | |
| Title: | Managing Member | |
| POTOMAC CAPITAL MANAGEMENT, L.L.C. | ||
| By: | /s/ Paul J. Solit | |
| Name: | Paul J. Solit | |
| Title: | Managing Member | |
/s/ Paul J. Solit | |
| PAUL J. SOLIT |