Dr. Eli Yablonovitch

Professor

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Biography

Eli Yablonovitch introduced the idea of strained semiconductor lasers, which demonstrated superior performance due to a reduced valence band (hole) effective mass. His work significantly influenced human interaction with the internet and optical telecommunications, particularly through the development of strained semiconductor lasers. He is recognized as the 'Father of the Photonic BandGap' concept, having coined the term 'Photonic Crystal.' The geometrical structure experimentally realized for the Photonic bandgap is known as 'Yablonovite.' In photovoltaic research, Yablonovitch introduced the 4(n squared) light-trapping factor, known as the 'Yablonovitch Limit,' which has been key to the worldwide implementation of commercial solar panels. His mantra 'a great solar cell needs a great LED' underpins the world record for solar cells with single-junction efficiencies of 29.1%, dual-junction of 31.5%, and quadruple-junction of 38.8%. He co-founded Luxtera Inc., a leader in Silicon Photonics technology, as well as Ethertronics Inc., which shipped over 2 billion cellphone antennas. Yablonovitch has been elected to several prestigious academies and has received numerous awards for his contributions to science and technology.

Research Interests

Experience

Professor Emeritus

2007-01-01 — Present

University of California, Berkeley • Berkeley, CA

Served as the James & Katherine Lau Chair Emeritus in Engineering.

Northrop-Grumman Chair Professor

1992-01-01 — 2007-01-01

University of California, Los Angeles • Los Angeles, CA

Held a distinguished chair position in Electrical Engineering.

Director

1984-01-01 — 1992-01-01

Bell Communications Research •

Distinguished Member of the Staff responsible for Solid-State Physics Research.

Worked at

1979-01-01 — 1984-01-01

Exxon •

Involved in photovoltaic solar energy research.

Professor

1972-01-01 — 1979-01-01

Harvard University •

Initially worked at Bell Telephone Laboratories before becoming a professor.

Awards

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OSA Ives-Quinn Medal

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Benjamin Franklin Medal

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IEEE Edison Medal

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Isaac Newton Medal

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Buckley Prize

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IEEE W.R. Cherry Solar Cell Award

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Rank Prize

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Harvey Prize

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IEEE Photonics Award

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IET Mountbatten Medal

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Julius Springer Prize

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R.W. Wood Prize

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W. Streifer Scientific Achievement Award

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Adolf Lomb Medal

Requirements for University of California, Berkeley

Doctorate Program
Requirements
GPA Requirement
Required:3
GRE Subject
Overall Score
Required:500
Overall
Required:500
TOEFL
Total
Required:90
IELTS
Overall
Required:7
Prerequisites
Bachelor's degree or recognized equivalent Preparation comparable to undergraduate major at Berkeley in Mathematics or Applied Mathematics 2 full years lower-division work (Calculus, Linear Algebra, Differential Equations, Multivariable Calculus) 8 one-semester upper-division courses (Real Analysis, Complex Analysis, Abstract Algebra, Linear Algebra)
Application Checklist
  • Graduate Application
  • Statement of Purpose
  • Personal History Statement
  • Three Letters of Recommendation
  • Unofficial Transcripts
  • C.V./Resume
  • Course and Textbook List
Specialization Notes

The Mathematics Subject GRE is required for the Fall 2026 admissions cycle. General GRE is optional.